Estimation

Estimation: 

Estimation Elizabeth Hill Third Grade

Estimation in the Real World: 

Estimation in the Real World

What are we learning?: 

What are we learning? The State of Georgia Says Students will solve problems by using mental math and estimation strategies to add and subtract.

In Kid Terms: 

In Kid Terms I can estimate to solve a problem by rounding first.

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 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 to try! : 

Your turn to try!

Day 2: 

Day 2

Let’s Play a Game: 

Let’s Play a Game

What are we learning?: 

What are we learning? The State of Georgia Says Students will solve problems by using mental math and estimation strategies to add and subtract.

In Kid Terms: 

In Kid Terms I can estimate to solve a problem by rounding first.

Estimating Sums: 

Estimating Sums Jennifer has 1,209 baseball cards. Joel has 2,581. About how many baseball cards do they have altogether? Decide whether you are adding or subtracting. Set the problem up. 1,209 + 2,581= Unless it tells you a certain place, always round to the largest place! 1,000 + 3,000= 4,000

Estimating Sums: 

Estimating Sums Martin’s mother gave him $20 to spend at the store. He bought a book for $3.51 and a candy bar for $1.29. Estimate How much Martin spent in all? Decide whether you are adding or subtracting. Set the problem up. $3.51 + $1.29= Unless it tells you a certain place, always round to the largest place! $4.00 + $1.00= $5.00

Estimating Sums: 

Estimating Sums Krys has 862 stickers. Aliyah has 743 stickers. Estimate to the nearest ten how many stickers did they have in all? Decide whether you are adding or subtracting. Set the problem up. 862 + 743 = Unless it tells you a certain place, always round to the largest place! 860 + 740= 1,600

Estimating Sums: 

Estimating Sums Matthew, Megan, and Brittney go to the grocery store for candy. Matthew picks out a Hershey bar that costs $1.29. Megan gets a bag of Twizzlers that costs $2.19. Brittney chooses a bag of gumdrops for $1.68. Matthew uses estimation to figure out if he could buy everything. About what was the total bill? Decide whether you are adding or subtracting. Set the problem up. $1.29+$2.19+$1.68= Unless it tells you a certain place, always round to the largest place! $1 + $2 + $2= $5

Day 3: 

Day 3

What are we learning?: 

What are we learning? The State of Georgia Says Students will solve problems by using mental math and estimation strategies to add and subtract.

In Kid Terms: 

In Kid Terms I can estimate to solve a problem by rounding first.

Estimating Sums: 

Estimating Sums Estimate means Round then add, And round then subtract! What? Round then add, And round then subtract! And soon it will mean, Round and multiply And multiply and multiply

Estimating Sums: 

Estimating Sums Jennifer has 1,209 baseball cards. Joel has 2,581. About how many more baseball cards does Joel have? Decide whether you are adding or subtracting. Set the problem up. 2,581 - 1,209 = Unless it tells you a certain place, always round to the largest place! 3,000 - 1,000= 2,000

Estimating Sums: 

Estimating Sums Thomas scores 6,789 points, and Noah scores 3,456 points on the new video game. About how many more points did Thomas score? Decide whether you are adding or subtracting. Set the problem up. 6,789 – 3,456 = Unless it tells you a certain place, always round to the largest place! 7,000 - 3,000= 4,000

Estimating Sums: 

Estimating Sums Harry is reading a chapter book that has 432 pages. He has already read 116 pages. Estimate how many pages he has left to read? Decide whether you are adding or subtracting. Set the problem up. 432 – 116= Unless it tells you a certain place, always round to the largest place! 400 - 100= 300