Doubles Plus or Minus 1

Front

What is 4 + 5?

Back

9

Front

What is 3 + 4?

Back

7

Front

What is 9 + 10?

Back

19

Front

What is 6 + 5?

Back

11

Front

What is 1 + 2?

Back

3

Front

What is the concept of 'Doubles Plus 1'?

Back

Doubles Plus 1 means taking a number, doubling it, and then adding 1. For example, for 4, double it to get 8, then add 1 to get 9.

Front

What is the concept of 'Doubles Minus 1'?

Back

Doubles Minus 1 means taking a number, doubling it, and then subtracting 1. For example, for 4, double it to get 8, then subtract 1 to get 7.

Front

What is 2 + 2?

Back

4

Front

What is 5 + 5?

Back

10

Front

What is 7 + 1?

Back

8