Adding within 20

Front

What is the sum of 8 and 7?

Back

15

Front

What is 3 plus 3?

Back

6

Front

What is the sum of 9 and 5?

Back

14

Front

What is 5 plus 10?

Back

15

Front

What is the maximum sum of two numbers that is less than or equal to 20?

Back

The maximum sum is 20.

Front

What is the smallest sum of two positive integers?

Back

The smallest sum is 2 (1+1).

Front

If you add two numbers and the result is 15, what could those numbers be?

Back

Possible pairs include (8,7), (9,6), (10,5), etc.

Front

What is the relationship between addition and subtraction?

Back

Subtraction is the inverse operation of addition.

Front

How can you check if your addition is correct?

Back

You can check by using subtraction or by counting objects.

Front

What is a number line and how is it used in addition?

Back

A number line is a visual representation of numbers that helps in understanding addition by counting forward.