Subtraction: Subtraction Mrs. Hill’s Third Grade Class
Slide 3: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 4: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 5: Ways to Subtract Drawing Take a Penny Fair is Fair Old School
Slide 6: First Things First Get out place value chart Get out place value chips
Slide 7: Just Watch How do I show 58 - 32? First make the BIG number Now think about what subtraction means… It means to take away. How can we show that? That’s right! Take away chips from each place. Now write the answer in each place. 6 2
Slide 8: Try It How do I show 64-32? First make the BIG number Now think about what subtraction means… That’s right! Take away chips from each place. Now write the answer in each place. 2 3
Slide 9: Let’s Make It Harder How do I show 473-132? First make the BIG number Now think about what subtraction means… Now take away chips from each place. Now write the answer in each place. 1 4 3
Slide 10: Work With Your Partner How do I show 353-231? First make the BIG number Now think about what subtraction means… Now take away chips from each place. Now write the answer in each place. 2 2 1
Day 2: Day 2
Slide 12: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 13: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 14: Ways to Subtract Drawing Take a Penny Fair is Fair Old School
Slide 15: Drawing Draw neatly Count twice to make sure you draw the right amount of circles Use x’s to show subtraction Count twice to make sure your right!
Slide 16: Let’s Try It How do I show 78-32? First make the BIG number Now think about what subtraction means… That’s right! Take away chips from each place. Now write the answer in each place. 6 4
Slide 17: Here’s Another How do I show 378-232? First make the BIG number Now think about what subtraction means… That’s right! Take away chips from each place. Now write the answer in each place. 6 4 1
Slide 18: Tricky, Tricky How do I show 4,567-2,121? First make the BIG number Now think about what subtraction means… That’s right! Take away chips from each place. Now write the answer in each place. 6 4 4 2,
Now You Try It. Work the first 2 with your partner.: Now You Try It. Work the first 2 with your partner.
Day 3: Day 3
Slide 21: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 22: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 23: Just Watch How do I show 56 - 37? First make the BIG number Now think about what subtraction means… 9 1 Can you take 7 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place.
Slide 24: Try It How do I show 45 - 27? First make the BIG number Now think about what subtraction means… 8 1 Can you take 7 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place.
Slide 25: Let’s Do Another How do I show 345 - 126? First make the BIG number Now think about what subtraction means… 9 1 Can you take 6 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place. 2
Slide 26: Work in Partners How do I show 534 - 126? First make the BIG number Now think about what subtraction means… 8 0 Can you take 6 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place. 4
Slide 27: Tricky, Tricky How do I show 4,534 – 2,151? First make the BIG number Now think about what subtraction means… 3 8 3 Can you take 1 one away? If not, you need to get a ten. Can you take 5 tens away? If not, you need to get a hundred. 2
Day 4: Day 4
Magic 9 Trick: Magic 9 Trick 17 - 9 Make it a friendly number by “Being Fair” +1 +1 18 -10 8 Notice the answer is just the ones place in the top number plus one more.
Magic 9 Trick: Magic 9 Trick 15 - 9 Let’s shorten the steps! Just add one to the number in the ones place of the big number. +1 6 Just think 5+1=6. That’s the answer!
Magic 9 Trick: Magic 9 Trick 18 - 9 Let’s shorten the steps! Just add one to the number in the ones place of the big number. +1 9 Just think 8+1=9. That’s the answer!
Magic 9 Trick: Magic 9 Trick 12 - 9 Let’s shorten the steps! Just add one to the number in the ones place of the big number. +1 3 Just think 2+1=3. That’s the answer!
Magic 9 Trick: Magic 9 Trick 13 - 9 Let’s shorten the steps! Just add one to the number in the ones place of the big number. +1 4 Just think 2+1=3. That’s the answer!
Magic 9 Trick: Magic 9 Trick 16 - 9 Let’s shorten the steps! Just add one to the number in the ones place of the big number. +1 7 Just think 2+1=3. That’s the answer!
Slide 35: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 36: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 37: Drawing Draw neatly Count twice to make sure you draw the right amount of circles Use x’s to show subtraction Count twice to make sure your right!
Slide 38: Just Watch How do I show 56 - 37? First make the BIG number Now think about what subtraction means… 9 1 Can you take 7 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place.
Slide 39: Let’s Do Another How do I show 345 - 126? First make the BIG number Now think about what subtraction means… 9 1 Can you take 6 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place. 2
Slide 40: Work in Partners How do I show 534 - 126? First make the BIG number Now think about what subtraction means… 8 0 Can you take 6 away? If not, you need to get a ten. Take 1 ten and change it into 10 ones in the ones place. Now subtract from each place. Now write the answer in each place. 4
Slide 41: Tricky, Tricky How do I show 4,534 – 2,151? First make the BIG number Now think about what subtraction means… 3 8 3 Can you take 1 one away? If not, you need to get a ten. Can you take 5 tens away? If not, you need to get a hundred. 2 Now subtract by marking out with x’s Count twice and write the answer in each place.
Now You Try It. Work the first 2 with your partner.: Now You Try It. Work the first 2 with your partner.
Day 5: Day 5
Magic 8 Trick: Magic 8 Trick 17 - 8 Make it a friendly number by “Being Fair” +2 +2 19 -10 9 Notice the answer is just the ones place in the top number plus two more.
Magic 8 Trick: Magic 8 Trick 15 - 8 Let’s shorten the steps! Just add two to the number in the ones place of the big number. +2 7 Just think 5+2=7. That’s the answer!
Magic 8 Trick: Magic 8 Trick 13 - 8 Let’s shorten the steps! Just add two to the number in the ones place of the big number. +2 5 Just think 3+2=5. That’s the answer!
Magic 8 Trick: Magic 8 Trick 12 - 8 Let’s shorten the steps! Just add 2 to the number in the ones place of the big number. +2 4 Just think 2+2=4. That’s the answer!
Slide 48: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 49: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 50: Ways to Subtract Drawing Take a Penny Fair is Fair Old School
Old School: Old School Stack it up Copy the problem correctly Line up your places Circle the largest number in each place Do all of your regrouping Finally subtract carefully
Old School: Old School 54-38= Stack it up! 54 -38 Make sure the places line up. Circle the largest number in each place. O T Look in the ones. If the big is on top, no need to stop. Big is on the floor? Go next door. Take one ten & that’s 10 ones more! 4 14 6 1 Check with addition by adding together the 2 bottom numbers. 38 +16 4 1 5 If the answer matches the top number, you’re right!
Old School: Old School 63-47= Stack it up! 63 -47 Make sure the places line up. Circle the largest number in each place. O T Look in the ones. If the big is on top, no need to stop. Big is on the floor? Go next door. Take one ten & that’s 10 ones more! 5 13 6 1 Check with addition by adding together the 2 bottom numbers. 47 +16 3 1 6 If the answer matches the top number, you’re right!
Old School: Old School 536-174= Stack it up! 536 -174 Make sure the places line up. Circle the largest number in each place. O T Look in the ones. If the big is on top, no need to stop. Big is on the floor? Go next door. Take one hundred & that’s 10 tens more! 13 2 6 Check with addition by adding together the 2 bottom numbers. 362 +174 3 1 5 If the answer matches the top number, you’re right! Look in the tens. If the big is on top, no need to stop. 4 3 6 H Big is on the floor? Go next door.
Old School: Old School 728-362= Stack it up! 728 -362 Make sure the places line up. Circle the largest number in each place. O T Look in the ones. If the big is on top, no need to stop. Big is on the floor? Go next door. Take one hundred & that’s 10 tens more! 12 6 6 Check with addition by adding together the 2 bottom numbers. 366 +362 2 1 7 If the answer matches the top number, you’re right! Look in the tens. If the big is on top, no need to stop. 6 3 8 H Big is on the floor? Go next door.
Now You Try It. Work with your partner.: Now You Try It. Work with your partner. 83-15= 67-39= 517-267= 756-548=
Day 6: Day 6
Slide 59: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 60: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 61: Ways to Subtract Drawing Take a Penny Fair is Fair Old School
Slide 62: Let’s Review Old School
Slide 63: Take a Penny We use Take a Penny when subtracting across zeros. Take a Penny means to take 1. Taking a Penny will take your number back one.
Slide 64: In order to Take a Penny, first think of money: If you take a penny from $1.00, how much do you have now? $0.99 If you take a penny from $2.00, how much do you have now? $1.99 If you take a penny from $5.00, how much do you have now? $4.99 If you take a penny from $10.00, how much do you have now? $9.99
Slide 65: Now think of whole numbers: If you take a penny from 10, what do you have now? 9 If you take a penny from 20, what do you have now? 19 If you take a penny from 50, what do you have now? 49 If you take a penny from 100, what do you have now? 99 If you take a penny from 800, what do you have now? 799
Slide 66: Old School 300-245= Stack it up! 300 - 245 Make sure your places line up! 245 + 55 Circle the largest number in each place. Look in the ones place Big on top? No need to stop! Big on the floor? Go next door. Can you take one 10? Then go to the hundreds place. Take one hundred that’s ten tens more. 2 10 Now take one ten that’s ten ones more. 9 10 Finally subtract! 5 5 0 1 0 1 3 Check with addition!
Slide 67: Try Take a Penny 300-245= Stack it up! 300 - 245 Make sure your places line up! Now take a penny from 300 -1 299 Finally subtract without regrouping -1 - 244 5 5 Circle the largest number in each place. Now you must be fair and do the same to the bottom number.
Slide 68: Try Take a Penny 400-178= Stack it up! 400 - 178 Make sure your places line up! Now take a penny from 300 -1 399 Finally subtract without regrouping -1 - 177 2 2 Circle the largest number in each place. Now you must be fair and do the same to the bottom number. 2
Slide 69: Try Take a Penny 700-376= Stack it up! 700 - 376 Make sure your places line up! Now take a penny from 300 -1 699 Finally subtract without regrouping -1 - 375 4 2 Circle the largest number in each place. Now you must be fair and do the same to the bottom number. 3
Slide 70: With Your Partner 1,000-867= Stack it up! 1000 - 867 Make sure your places line up! Now take a penny from 300 -1 999 Finally subtract without regrouping -1 - 866 3 3 Circle the largest number in each place. Now you must be fair and do the same to the bottom number. 1
Now it is your turn. Work the first 4 with your partner.: Now it is your turn. Work the first 4 with your partner.
Day 7: Day 7
Slide 73: Review Take a Penny 5,000-2,867= Stack it up! 5000 - 2867 Make sure your places line up! Now take a penny from 300 -1 4999 Finally subtract without regrouping -1 - 2866 3 3 Circle the largest number in each place. Now you must be fair and do the same to the bottom number. 1 2
Slide 74: Can you use Take a Penny if you only have one zero?
Slide 75: Take a Penny Twist 304-245= Stack it up! 304 - 245 Make sure your places line up! Now think 30=___+1 Finally subtract without regrouping 9 5 Circle the largest number in each place. 29 +1
Slide 76: Take a Penny Twist 507-129= Stack it up! 507 - 129 Make sure your places line up! 8 Now think 50=___+1 Finally subtract without regrouping 7 Circle the largest number in each place. 49 +1 3
Slide 77: Take a Penny Twist 908-549= Stack it up! 908 - 549 Make sure your places line up! 9 Now think 90=___+1 Finally subtract without regrouping 5 Circle the largest number in each place. 89 +1 3
Slide 78: Take a Penny Twist 7,006-1,738= Stack it up! 7,006 -1,738 Make sure your places line up! 8 Now think 700=___+1 Finally subtract without regrouping 6 Circle the largest number in each place. 2 699 +1 5
Now You Try It. Work with your partner.: Now You Try It. Work with your partner. 80-45= 208-139= 500-267= 706-548=
Day 8: Day 8
Slide 81: M3N2. Students will further develop their skills of subtraction by using the properties of subtraction to compute and verify the results of computation and apply these skills in problem solving. What are we learning? The State of Georgia says that…
Slide 82: In kid terms, please I can correctly subtract numbers, can check my answers, and can use subtraction to solve problems.
Slide 83: Ways to Subtract Drawing Take a Penny Fair is Fair Old School
Slide 84: Be Fair Subtraction is easier when the bottom number ends in 1 or more zeros. Look at the bottom number and think about what you need to add or subtract to get it to a number that ends with zeros. You are looking for a tens or hundreds number.
Slide 85: It’s best if we review what will take a number to the next tens number.
Fair is Fair: Fair is Fair 54 - 28 Look at the bottom number. What can you add or subtract to it to make it to the nearest tens number? + 2 - 30 Fair is Fair! Now you have to do the same to the other number. + 2 56 Now subtract without regrouping. 6 2 Circle the biggest number in each place.
Fair is Fair: Fair is Fair 71 - 24 Look at the bottom number. What can you add or subtract to it to make it to the nearest tens number? + 6 - 30 Fair is Fair! Now you have to do the same to the other number. + 6 77 Now subtract without regrouping. 7 4 Circle the biggest number in each place.
Work in Partners: Work in Partners 94 - 65 Look at the bottom number. What can you add or subtract to it to make it to the nearest tens number? + 5 - 70 Fair is Fair! Now you have to do the same to the other number. + 5 99 Now subtract without regrouping. 9 2 Circle the biggest number in each place.
Fair is Fair: Fair is Fair 271 - 124 Look at the bottom number. What can you add or subtract to it to make it to the nearest tens number? + 6 - 130 Fair is Fair! Now you have to do the same to the other number. + 6 277 Now subtract without regrouping. 7 4 Circle the biggest number in each place. 1
Fair is Fair: Fair is Fair 729 - 278 Now look at the bottom number. What can you add or subtract to it to make it to the nearest tens number? + 3 - 30 Fair is Fair! Now you have to do the same to the other number. 75 Now subtract without regrouping. 5 Circle the biggest number in each place. 4 Since the big number is on top in the ones place, you can subtract. 1 + 3 Now put them back in the right places. 5 4
Now You Try It. Work with your partner.: Now You Try It. Work with your partner. 63-48= 894-279= 72-27= 738-274=