Mental Addition and Subtraction to 100

Front

What is mental addition?

Back

Mental addition is the process of adding numbers in your head without using paper or a calculator.

Front

What is mental subtraction?

Back

Mental subtraction is the process of subtracting numbers in your head without using paper or a calculator.

Front

What is the sum of 62 and 18?

Back

80

Front

What is 66 minus 42?

Back

24

Front

What is 26 minus 18?

Back

8

Front

What is 58 minus 18?

Back

40

Front

What is the sum of 25 and 30?

Back

55

Front

What does 'sum' mean in math?

Back

The sum is the result of adding two or more numbers together.

Front

What does 'difference' mean in math?

Back

The difference is the result of subtracting one number from another.

Front

If you add 10 to 25, what do you get?

Back

35