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Mental Addition and Subtraction to 100 - 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=40, Mode=add

Add.
1.   39 + 10 = 2.   26 + 10 =

Complexity=90, Mode=add

Add.
1.   90 + 10 = 2.   38 + 10 =

Complexity=40, Mode=sub

Subtract.
1.   15 - 10 = 2.   11 - 10 =

Complexity=90, Mode=sub

Subtract.
1.   61 - 10 = 2.   81 - 10 =

Complexity=40

Add or subtract.
1.   38 + 10 = 2.   10 - 10 =

Complexity=90

Add or subtract.
1.   43 - 10 = 2.   33 - 10 =

Answers

Complexity=40, Mode=add

Add.
#Correct AnswerYour Answer
139 + 10 =
Solution
#Correct AnswerYour Answer
226 + 10 =
Solution

Complexity=90, Mode=add

Add.
#Correct AnswerYour Answer
190 + 10 =
Solution
  1  
   90
+  10
  100
#Correct AnswerYour Answer
238 + 10 =
Solution

Complexity=40, Mode=sub

Subtract.
#Correct AnswerYour Answer
115 - 10 =
Solution
#Correct AnswerYour Answer
211 - 10 =
Solution

Complexity=90, Mode=sub

Subtract.
#Correct AnswerYour Answer
161 - 10 =
Solution
#Correct AnswerYour Answer
281 - 10 =
Solution

Complexity=40

Add or subtract.
#Correct AnswerYour Answer
138 + 10 =
Solution
#Correct AnswerYour Answer
210 - 10 =
Solution

Complexity=90

Add or subtract.
#Correct AnswerYour Answer
143 - 10 =
Solution
#Correct AnswerYour Answer
233 - 10 =
Solution
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