Double Digit Addition

Front

What is double digit addition?

Back

Double digit addition is the process of adding two numbers that each have two digits, such as 23 + 45.

Front

What is a partial sum?

Back

A partial sum is the sum of parts of a number. For example, in 45 + 4, the partial sums can be 40 + 4 + 5.

Front

How do you break apart numbers in addition?

Back

Breaking apart numbers means separating them into tens and ones to make addition easier. For example, 45 can be broken into 40 and 5.

Front

What is the sum of 45 + 4?

Back

49

Front

What is the sum of 16 + 33?

Back

49

Front

What is the sum of 50 + 10 + 4?

Back

64

Front

What is the sum of 60 + 10 + 4?

Back

74

Front

What is the sum of 20 + 13?

Back

33

Front

What is the sum of 50 + 14?

Back

64

Front

What is the sum of 70 + 20?

Back

90