Adding 3 Numbers within 20

Front

What is 8 + 1 + 6?

Back

15

Front

What is 9 + 2 + 5?

Back

16

Front

What is 1 + 6 + 4?

Back

11

Front

What is 4 + 7 + 3?

Back

14

Front

What is 2 + 9 + 7?

Back

18

Front

What is the sum of three numbers?

Back

The total when you add three numbers together.

Front

What does 'addition' mean?

Back

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

Front

What is a 'number line'?

Back

A line that shows numbers in order, used to help with addition and subtraction.

Front

What is the 'commutative property of addition'?

Back

It means you can add numbers in any order and the sum will be the same.

Front

What is the 'associative property of addition'?

Back

It means when adding three or more numbers, the way you group them does not change the sum.