Estimating Sums and Differences of Two-Digit Numbers

While on a trip, Becca counted 148 red cars and 153 blue cars. Jasmine, her sister, counted 184 white cars and 92 green cars. Rounding to the tens place, who counted more cars?

• Becca counted more, she got 300

• Jasmine counted more, she got 300

• Becca counted more, she got 250

• Jasmine counted more, she got 250

Use compatible numbers to estimate the value of 76 + 26.

• 75 + 25 = 100.

• 80 + 30 = 110

• 76 + 26 = 102

• 70 + 20 = 90

Estimate the sum of 37+91 by rounding to the nearest tens

• 120

• 150

• 130

• 140

Estimate the sum of 52+59 by rounding to the nearest tens

• 110

• 100

• 111

• 90

Julie was playing Fruit Ninja on her tablet. On the first round she scored 225 points, on the second she got 199 points and in the third round she scored 94 points. Which of the following number sentences shows one way to estimate how many points Julie won during these 3 rounds?

• 200 + 200 + 100 = 500

• 200 + 200 + 50 = 450

• 200 + 100 + 90 = 390

• 100 + 100 + 100 =300

Find the total when 523 and 367 are added together.

• 456

• 890

• 8900

• 1000

What is the sum of 34 and 25?

• 40

• 59

• 57

• 60

Estimate means to...

• jump

• laugh

• round

• add

Round to the nearest ten to estimate the difference.
61 - 23 = 

• 40

• 80

• 30

• 90

Round to the nearest ten to estimate the sum.
73 + 48 = 

• 20

• 30

• 110

• 120