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Subtraction in Terms of Addition - Sample Math Practice Problems

The math problems below can be generated by MathScore.com, a math practice program for schools and individual families. References to complexity and mode refer to the overall difficulty of the problems as they appear in the main program. In the main program, all problems are automatically graded and the difficulty adapts dynamically based on performance. Answers to these sample questions appear at the bottom of the page. This page does not grade your responses.

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Complexity=10, Mode=simple

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

1.   5 + 2 = 7
So,  7 - 5 =
2.   9 - 6 = 3
So,  6 + = 9

Complexity=20, Mode=simple

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

1.   20 - 15 = 5
So,  15 + = 20
2.   19 - 18 = 1
So,  18 + = 19

Complexity=20, Mode=multi

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

1.   18 - 14 = __ is the same as (choose all that apply):
18 = __ + 14  
__ + 14 = 18  
__ = 18 + 14  
18 = 14 - __
2.   15 - 12 = __ is the same as (choose all that apply):
15 = 12 + __  
__ = 15 + 12  
12 - __ = 15
__ + 12 = 15  

Complexity=20, Mode=adv

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

1.   19 - 14 = __ is the same as (choose all that apply):
14 + __ = 19  
19 - __ = 14  
__ = 19 + 14  
19 = 14 - __
19 = 14 + __  
2.   13 - 2 = __ is the same as (choose all that apply):
13 - __ = 2  
13 = __ + 2  
2 - __ = 13
2 + __ = 13  
13 + 2 = __  

Answers


Complexity=10, Mode=simple

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

#ProblemCorrect AnswerYour Answer
15 + 2 = 7
So,  7 - 5 =
#ProblemCorrect AnswerYour Answer
29 - 6 = 3
So,  6 + = 9

Complexity=20, Mode=simple

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

#ProblemCorrect AnswerYour Answer
120 - 15 = 5
So,  15 + = 20
#ProblemCorrect AnswerYour Answer
219 - 18 = 1
So,  18 + = 19

Complexity=20, Mode=multi

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

#ProblemCorrect AnswerYour Answer
118 - 14 = __ is the same as (choose all that apply):
18 = __ + 14  
__ + 14 = 18  
__ = 18 + 14  
18 = 14 - __
Solution
The correct missing number is 4.
#ProblemCorrect AnswerYour Answer
215 - 12 = __ is the same as (choose all that apply):
15 = 12 + __  
__ = 15 + 12  
12 - __ = 15
__ + 12 = 15  
Solution
The correct missing number is 3.

Complexity=20, Mode=adv

When two smaller numbers add up to a bigger number, you can use that backwards to find a missing smaller number -- or vice-versa!

#ProblemCorrect AnswerYour Answer
119 - 14 = __ is the same as (choose all that apply):
14 + __ = 19  
19 - __ = 14  
__ = 19 + 14  
19 = 14 - __
19 = 14 + __  
Solution
The correct missing number is 5.
#ProblemCorrect AnswerYour Answer
213 - 2 = __ is the same as (choose all that apply):
13 - __ = 2  
13 = __ + 2  
2 - __ = 13
2 + __ = 13  
13 + 2 = __  
Solution
The correct missing number is 11.
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