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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.

See some of our other supported math practice problems.

### 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

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 = __

### 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!

15 + 2 = 7
So,  7 - 5 =
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!

120 - 15 = 5
So,  15 + = 20
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!

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.
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.

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

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.
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.   