Adding within 20

Front

What is the sum of 15 and 4?

Back

19

Front

What is the sum of 9 and 8?

Back

17

Front

What is the sum of 12 and 7?

Back

19

Front

What is the sum of 6 and 7?

Back

13

Front

What is the sum of 7 and 9?

Back

16

Front

What is the maximum sum you can get when adding two numbers within 20?

Back

20

Front

What is the minimum sum you can get when adding two positive numbers?

Back

2 (1+1)

Front

If you add 10 to a number, what is the maximum number you can start with to stay within 20?

Back

10 (10+10=20)

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 use subtraction to verify your answer.