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Divide Decimals and Estimate the Answer (1)

In this worksheet, students round two decimals to the nearest whole numbers before subtracting them.

'Divide Decimals and Estimate the Answer (1)' worksheet

Key stage:  KS 2

Curriculum topic:   Number: Fractions, Decimals and Percentages

Curriculum subtopic:   Solve Rounding Problems

Difficulty level:  

Worksheet Overview

QUESTION 1 of 10

We can estimate the answers by first rounding both decimals to the nearest whole numbers and then finding the difference between them.

 

Example:

45.7 - 16.4 can be estimated by rounding each number to the nearest whole numbers 46 - 16

= 30

 

 

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

52.8 - 12.8  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

35.3 - 28.6  =   ____  -  ____  =   ____

 Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

43.7 - 14.9  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

84.7 - 37.2  =   ____  -  ____  =   ____

Estimate the answer to the addition by rounding to the nearest whole numbers first.

 

66 + 12.1  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

87.6 - 36.4  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

25.6 - 19.8  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

41.2 - 10.2  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

30.6 - 13  =   ____  -  ____  =   ____

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

20.7 - 17.2  =   ____  -  ____  =   ____

  • Question 1

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

52.8 - 12.8  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
How did you do? We needed to round both of these numbers up as the number after the decimal point was above 5. Therefore, we should have calculated 53 - 13 = 40
  • Question 2

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

35.3 - 28.6  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
We had to round 35.3 down to 35, as the number after the decimal point, 3, is less than 5. We then rounded 28.6 up as the number after the decimal point was greater than 5, which should have left us with the following sum: 35 - 29 = 6
  • Question 3

 Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

43.7 - 14.9  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
Are you getting the hang of this now? For both of our decimal numbers, we need to round up to give us: 44 - 15 = 29
  • Question 4

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

84.7 - 37.2  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
Our first number needs to round up and our second number needs to round down. Once we've made these decimals into whole numbers, it's much easier to calculate the sum! 85 - 37 = 48
  • Question 5

Estimate the answer to the addition by rounding to the nearest whole numbers first.

 

66 + 12.1  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
Did you spot the change in the operation sign? 66 was already a whole number, so we just needed to round down the 12.1 to 12 and then add both numbers together. 66 + 12 = 78
  • Question 6

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

87.6 - 36.4  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
The operation sign swapped back again, did you spot it? We needed to round our first number up, and round our second number down here. 88 - 36 = 52
  • Question 7

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

25.6 - 19.8  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
So, both numbers here needed to be rounded up. Which once you had done that made quite a tidy sum! 26 - 20 = 6
  • Question 8

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

41.2 - 10.2  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
Both of these decimal numbers needed to round down as the number after the decimal in both cases was less than 5. So, we are left with the following sum: 41 -10 = 31
  • Question 9

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

30.6 - 13  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
Did you get this one? Hopefully, you have cracked this by now! We needed to round the first number up and then subtract 13. 31-13 = 18
  • Question 10

Estimate the answer to the subtraction by rounding to the nearest whole numbers first.

 

20.7 - 17.2  =   ____  -  ____  =   ____

CORRECT ANSWER
EDDIE SAYS
The last question mastered! How did you do? 21- 17 = 4 Why not try another activity in your account and see how you get on!
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