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## Number Line Add Subtract - 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=20, Mode=simple

What can you tell from the number line?

 1.   13 - 5 = 2.   13 + 7 =

### Complexity=100, Mode=simple

What can you tell from the number line?

 1.   57 + 30 = 2.   96 - 22 =

### Complexity=100, Mode=complex

What can you tell from the number line?

1.

Which problem(s) does this number line answer? Choose all that apply.
 45 + __ = 86
 86 + 45 =
 86 - 45 =
 45 - __ = 86
 None of the above
2.

Which problem(s) does this number line answer? Choose all that apply.
 __ + 43 = 99
 43 + 56 = __
 56 - 43 = __
 99 - 56 = __
 None of the above

### Complexity=20, Mode=simple

What can you tell from the number line?

1

13 - 5 =
Solution
Read off the first number: 8.
2

13 + 7 =
Solution
Read off the end number: 20.

### Complexity=100, Mode=simple

What can you tell from the number line?

1

57 + 30 =
Solution
Read off the end number: 87.
2

96 - 22 =
Solution
Read off the first number: 74.

### Complexity=100, Mode=complex

What can you tell from the number line?

1

Which problem(s) does this number line answer? Choose all that apply.
 45 + __ = 86
 86 + 45 =
 86 - 45 =
 45 - __ = 86
 None of the above
Solution
Two of the choices mean the same thing:
45 + __ = 86
86 - 45 = __.
The number line does not really help you; you can read off 45 from the line as easily as from the label. To get the answer, you still have to subtract or do some counting. A label for 41 would have been a lot more helpful.
The remaining choices have nothing to do with this number line:
86 + 45 (= 131) and
45 - (-41) = 86.
2

Which problem(s) does this number line answer? Choose all that apply.
 __ + 43 = 99
 43 + 56 = __
 56 - 43 = __
 99 - 56 = __
 None of the above
Solution
Read off the end number 99 to tell the sum of either
56 + 43 or
43 + 56.
Read off the first number 56 for
99 - 43 = __ or
__ + 43 = 99 or
43 + __ = 99.
The label for 43 tells
99 - 56 = __ or
56 + __ = 99 or
__ + 56 = 99.