TABLES MAGIC

Don’t know your tables? Never mind, in this system you don’t need them beyond 5 × 5!

- Suppose you need
**8 x 7**

8 is 2 below 10 and 7 is 3 below 10.

Think of it like this:

The answer is 56.

The diagram below shows how you get it.

You subtract crosswise 8-3 or 7 - 2 to get**5**,

the first figure of the answer.

And you multiply vertically: 2 x 3 to get**6**,

the last figure of the answer.

That's all you do:

See how far the numbers are below 10, subtract one

number's deficiency from the other number, and

multiply the deficiencies together.

**7 x 6 = 42**

Here there is a carry: the 1 in the 12 goes over to

make 3 into 4.

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Tables Magic

The whole heaven is number

and harmony

and harmony

ARISTOTLE