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Understanding 1

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x Multiply
2 x 1 =
÷ Divide
5 ÷ 1 =
+ Addition
2 + 1 =
- Subtraction
8 - 1 =

One, 1, •, I

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.

x0123456789101112
10123456789101112

Number in grey (left) + number in grey (top) = number in white OR number in white - number in grey = other number in grey.

+0123456789101112
112345678910111213

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