Estimation and Rounding Quiz

What is the purpose of rounding numbers when estimating?

• To make numbers larger

• To simplify calculations while keeping values close

• To make numbers smaller

• To change the original value completely

If you have 83 students and want to estimate the number of pizza rolls needed, which number would you round 83 to?

• 100

• 90

• 80

• 70

When estimating the number of pizza rolls, why is 9 rounded to 10?

• Because 9 is closer to 10 than to 0

• Because 9 is a prime number

• Because 9 is an odd number

• Because 10 is easier to multiply

How many packs of party favors are needed if each pack contains 80 favors and you need approximately 640 favors?

• 8

• 7

• 9

• 6

Why is 643 rounded to 640 when estimating the number of party favor packs?

• Because 640 is a round number

• Because 640 is divisible by 8

• Because 640 is easier to remember

• Because 643 is too large