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Find the Number That Has Been Added

In this worksheet, students work out the number that has been added to another number.

Key stage:  KS 3

Curriculum topic:  Number

Curriculum subtopic:  Use Relationships Between Operations

Difficulty level:  

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QUESTION 1 of 10

In this worksheet, we must find the number which has been added.


Example

What needs to be added to change 9.799 to 9.8 ?

 

Answer

We use the inverse of addition (i.e. subtraction) to work this out.  

9.8 - 9.799 = 0.001

What needs to be added to change 7.272 to 7.274 ?

What needs to be added to change 8.031 to 8.035 ?


What needs to be added to change 7.403 to 7.408 ?


What needs to be added to change 8.906 to 8.908 ?


What needs to be added to change 7.68 to 7.681 ?


What needs to be added to change 5.47 to 5.475 ?


What needs to be added to change 2.501 to 2.513 ?

 

What needs to be added to change 6.6 to 6.656 ?

 

What needs to be added to change 0.227 to 0.23 ?

 

What needs to be added to change 4.807 to 4.9 ?

 

  • Question 1

What needs to be added to change 7.272 to 7.274 ?

CORRECT ANSWER
0.002
  • Question 2

What needs to be added to change 8.031 to 8.035 ?


CORRECT ANSWER
0.004
  • Question 3

What needs to be added to change 7.403 to 7.408 ?


CORRECT ANSWER
0.005
  • Question 4

What needs to be added to change 8.906 to 8.908 ?


CORRECT ANSWER
0.002
  • Question 5

What needs to be added to change 7.68 to 7.681 ?


CORRECT ANSWER
0.001
  • Question 6

What needs to be added to change 5.47 to 5.475 ?


CORRECT ANSWER
0.005
  • Question 7

What needs to be added to change 2.501 to 2.513 ?

 

CORRECT ANSWER
0.012
  • Question 8

What needs to be added to change 6.6 to 6.656 ?

 

CORRECT ANSWER
0.056
  • Question 9

What needs to be added to change 0.227 to 0.23 ?

 

CORRECT ANSWER
0.003
  • Question 10

What needs to be added to change 4.807 to 4.9 ?

 

CORRECT ANSWER
0.093
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