Estimation with Multiplication

Estimation with Multiplication: 

Estimation with Multiplication By Elizabeth Hill Third Grade

Estimate Means…: 

Estimate Means… Round then add, And round then subtract, Round then add, And round then subtract. And now it means, Round and multiply, And multiply, And multiply!

In Kid Terms: 

In Kid Terms M3N3f Students will further develop their understanding of multiplication of whole numbers and develop the ability to apply it in problem solving by using mental math and estimation strategies to multiply. The State of Georgia Says

In Kid Terms: 

In Kid Terms I can estimate the answers to multiplication problems.

Slide 5: 

Estimation Estimate means to use rounding to make a good guess about the answer to a problem. Estimation Words 1. About 2. Around 3. Roughly 4. Approximately 5. Ballpark How to Estimate 1. Round to the greatest place unless it tells you a place. 2. After you round, perform the operation (+, -, x)

Let’s Practice Rounding: 

Let’s Practice Rounding Rounding means to get a number to the nearest 10, 100, 1,000…a number ending in zeros! It might be to the largest place or it could be another place in a number.

Rounding Numbers: 

Rounding Numbers

Rounding Numbers Song: 

Rounding Numbers Song Rounding numbers is so fun! We will do it ‘til we’re done. If the number’s 1,2,3,4 Round it down right through the floor! If the number’s 5,6,7,8,9 Round it up it’ll be just fine! Round up! Round down! Rounding numbers…1,2…3,4!

Round to the Nearest Ten: 

Round to the Nearest Ten 34 Underline the place you are rounding to. Circle the number to the right , because it is always right about rounding! Now do you go back down to 30 or up to 40? If the number’s 1,2,3,4 round it down right through the floor. If the number’s 5,6,7,8,9 round it up it’ll be just fine. 30 40

Estimate to the Nearest Ten: 

Estimate to the Nearest Ten 79 Underline the place you are rounding to. Circle the number to the right , because it is always right about rounding! Now do you go back down to 70 or up to 80? If the number’s 1,2,3,4 round it down right through the floor. If the number’s 5,6,7,8,9 round it up it’ll be just fine. 70 80

Estimate to the Nearest Hundred: 

Estimate to the Nearest Hundred 235 Underline the place you are rounding to. Circle the number to the right , because it is always right about rounding! Now do you go back down to 200 or up to 300? If the number’s 1,2,3,4 round it down right through the floor. If the number’s 5,6,7,8,9 round it up it’ll be just fine. 200 300

Estimate to the Nearest Hundred: 

Estimate to the Nearest Hundred 891 Underline the place you are rounding to. Circle the number to the right , because it is always right about rounding! Now do you go back down to 800 or up to 900? If the number’s 1,2,3,4 round it down right through the floor. If the number’s 5,6,7,8,9 round it up it’ll be just fine. 800 900

Your Turn!: 

Your Turn! Estimate each number to the greatest place. 1. 78 2. 34 3. 67 4. 652 5. 923 6. 283 STOP! Call me to check before you go to #4. STOP! Call me to check before you go to #7. 7. 3,198 8. 5,723 9. 9,854 10. 2,387

Day 2: 

Day 2

In Kid Terms: 

In Kid Terms M3N3f Students will further develop their understanding of multiplication of whole numbers and develop the ability to apply it in problem solving by using mental math and estimation strategies to multiply. The State of Georgia Says

In Kid Terms: 

In Kid Terms I can estimate the answers to multiplication problems.

Estimate Means…: 

Estimate Means… Round then add, And round then subtract, Round then add, And round then subtract. And now it means, Round and multiply, And multiply, And multiply!

Slide 18: 

Estimation Estimate means to use rounding to make a good guess about the answer to a problem. Estimation Words 1. About 2. Around 3. Roughly 4. Approximately 5. Ballpark How to Estimate 1. Round to the greatest place unless it tells you a place. 2. After you round, perform the operation (+, -, x)

To be able to estimate multiplication, you must know when to multiply.: 

To be able to estimate multiplication, you must know when to multiply. To know when to multiply, you have to remember your key words!

Slide 20: 

Key Words Addition Words aits Subtraction Words ltogether n All B A I T S otal um M M M L L C D F uch more any more uch ______er eft ess hange ifference ewer Multiplication Words

See if you can spot the key words that tell you to multiply!: 

See if you can spot the key words that tell you to multiply!

Slide 22: 

Key Words Addition Words aits Subtraction Words ltogether n All B A I T S otal um M M M L L C D F uch more any more uch ______er eft ess hange ifference ewer Multiplication Words P E G S er ach roup et

See if you can spot the key words!: 

See if you can spot the key words! Jennifer has 1,209 baseball cards. Joel has 987. How many baseball cards do they have altogether? What does the key word tell you to do? ADD

See if you can spot the key words!: 

See if you can spot the key words! Each orange costs $4.00. How much do 80 oranges cost? What does the key word tell you to do? MULTIPLY

See if you can spot the key words!: 

See if you can spot the key words! Bob has 1,297 football cards. Sammy has 1,488. How many more cards does Sammy have? What does the key word tell you to do? SUBTRACT

See if you can spot the key words!: 

See if you can spot the key words! There are 5 groups of children on the playground. If there are 4 in each group, how many total children are there? What does the key word tell you to do? MULTIPLY When you see an addition key word and a multiplication key word, multiplication kicks additions “booty”!

See if you can spot the key words!: 

See if you can spot the key words! There are 7 hair bows in a set. Aubrey has 5 sets. How many hair bows are there altogether? What does the key word tell you to do? MULTIPLY When you see an addition key word and a multiplication key word, multiplication kicks additions “booty”!

Can you remember the key words?: 

Can you remember the key words? Fill in the graphic organizer with your partner to show you know the words that tell you to add, subtract, and multiply.

Day 3: 

Day 3

In Kid Terms: 

In Kid Terms M3N3f Students will further develop their understanding of multiplication of whole numbers and develop the ability to apply it in problem solving by using mental math and estimation strategies to multiply. The State of Georgia Says

In Kid Terms: 

In Kid Terms I can estimate the answers to multiplication problems.

To estimate, we need to review some of our favorite songs.: 

To estimate, we need to review some of our favorite songs.

Estimate Means…: 

Estimate Means… Round then add, And round then subtract, Round then add, And round then subtract. And now it means, Round and multiply, And multiply, And multiply!

Zero the Hero: 

Zero the Hero Zero is the hero, He just won’t stop. All you do is count him, At the top. You add those zeros, To the basic fact, And you will get the answer, Just like that!

Let’s Estimate Some Products: 

Let’s Estimate Some Products 24 x 8 = The Hill family is planting a garden. There 8 groups of plants. Every group has 24 plants in it. About how many plants are in the garden? Do you see a key word? What does the key word tell you to do? MULTIPLY What does the word ABOUT tell you to do? ESTIMATE To estimate you must ROUND first! 20 x 8 = What is the basic fact? 16 2x8= Don’t forget Zero the Hero! 0

Let’s Estimate Some Products: 

Let’s Estimate Some Products 45 x 2 = Amaya and Destiny have 45 sets of socks. There are 2 socks in a set. About how many socks do they have? Do you see a key word? What does the key word tell you to do? MULTIPLY What does the word ABOUT tell you to do? ESTIMATE To estimate you must ROUND first! 50 x 2 = What is the basic fact? 10 5x2= Don’t forget Zero the Hero! 0

Let’s Estimate Some Products: 

Let’s Estimate Some Products 167 x 7 = There are 7 bags of marbles. Each bag has 167 marbles. About how many marbles are there? Do you see a key word? What does the key word tell you to do? MULTIPLY What does the word ABOUT tell you to do? ESTIMATE To estimate you must ROUND first! 200 x 2 = What is the basic fact? 4 2x2= Don’t forget Zero the Hero! 0 0

Let’s Estimate Some Products: 

Let’s Estimate Some Products 542 x 6 = There are 6 boxes. Each box has 542 books. About how many books are there? Do you see a key word? What does the key word tell you to do? MULTIPLY What does the word ABOUT tell you to do? ESTIMATE To estimate you must ROUND first! 500 x 6 = What is the basic fact? 30 5x6 Don’t forget Zero the Hero! 0 0

Day 4: 

Day 4

In Kid Terms: 

In Kid Terms M3N3f Students will further develop their understanding of multiplication of whole numbers and develop the ability to apply it in problem solving by using mental math and estimation strategies to multiply. The State of Georgia Says

In Kid Terms: 

In Kid Terms I can estimate the answers to multiplication problems.

Estimate Means…: 

Estimate Means… Round then add, And round then subtract, Round then add, And round then subtract. And now it means, Round and multiply, And multiply, And multiply!

Zero the Hero: 

Zero the Hero Zero is the hero, He just won’t stop. All you do is count him, At the top. You add those zeros, To the basic fact, And you will get the answer, Just like that!

Estimation Game: 

Estimation Game It’s on like Donkey Kong!