Lesson Worksheet: Estimating Differences Mathematics

In this worksheet, we will practice estimating the result of the subtraction of two two-digit numbers.

Q1:

Round 27 and 17 to the nearest ten, then find the difference.

Q2:

If Samar is 47 and Rania is 13, estimate the difference between their ages (by rounding each number to the nearest ten).

Q3:

Estimate the result of 7834 by rounding to the nearest ten.

Q4:

Joud wants to estimate the difference between 56 and 41. She says: “If we round both numbers to the nearest 10, the estimated difference is 20”. Is Joud’s statement true or false?

  • ATrue
  • BFalse

Q5:

A student wants to estimate the result of 5339 by rounding the numbers to the nearest ten. Which number line represents the correct way to round these numbers?

  • A
  • B
  • C
  • D

Use this rounding to estimate the result of 5339.

Q6:

Faisal has a jar of 86 marbles.

He gives away 17 marbles and estimates how many are left by rounding both numbers to the nearest ten.

Which calculation does Faisal use?

  • A9020
  • B9010
  • C8010
  • D8020

What is the estimated number of marbles Faisal has left?

Q7:

Look at how Mohammed estimated the difference by rounding to the nearest ten.

4331 is about 10.

Estimate the difference by rounding to the nearest ten.

5721 is about .

Estimate the difference by rounding to the nearest ten.

5328 is about .

Q8:

Seif estimates the difference between 75 and another number by rounding each number to the nearest ten using a number track.

What does he round 75 to?

He subtracts the two rounded numbers to find an estimated difference of 50.

Complete the following: Seif rounds his other number to .

Q9:

Maryam estimates 4931 by rounding both numbers to the nearest 10. Does she get an estimate that is greater or smaller than the exact answer?

  • ASmaller
  • BGreater

Q10:

The teacher asked Fawaz and Fahd to find the estimated result of 6429 by rounding numbers to the nearest ten. Fawaz said, “The estimated result is 30,” but Fahd said, “The estimated result is 40.” Who is correct?

  • AFahd
  • BFawaz

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