Fluently adding and subtracting numbers between 20 and 100

Front

81 + 17 = ?

Back

98

Front

27 + 18 = ?

Back

45

Front

74 + 5 = ?

Back

79

Front

17 + 24 = ?

Back

41

Front

Estimate and add: 66 + 22

Back

90

Front

What is addition?

Back

Addition is the process of finding the total or sum by combining two or more numbers.

Front

What is subtraction?

Back

Subtraction is the process of finding the difference between two numbers by taking one number away from another.

Front

What is the sum of 30 and 20?

Back

50

Front

What is the difference between 50 and 30?

Back

20

Front

If you have 40 apples and you buy 15 more, how many apples do you have?

Back

55