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x Multiply

2 x 1 =

÷ Divide

5 ÷ 1 =

+ Addition

2 + 1 =

- Subtraction

8 - 1 =

**Multiply x * . () by one:**

The original number stays the same

**Divide ÷ / by one:**

The original number stays the same

**Add + one:**

One bigger than the original number

**Take - one:**

One less than the original number

Number in grey (left) x number in grey (top) = number in white __OR__ number in white ÷ number in grey = __other__ number in grey.

x | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|

1 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |

Number in grey (left) + number in grey (top) = number in white __OR__ number in white - number in grey = __other__ number in grey.

+ | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 |
---|---|---|---|---|---|---|---|---|---|---|---|---|---|

1 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 |

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