AT A PARTY

At a party surprise your friends with this spectacular way of multiplying large numbers together in your head.

- Suppose you want to
**multiply 88 by 98**.

Not easy,you might think. But with

VERTICALLY AND CROSSWISE you can give

the answer immediately, using the same method

as before.

Both 88 and 98 are close to 100.

88 is 12 below 100 and 98 is 2 below 100.

You can imagine the sum set out like this:

As before the**86**comes from

subtracting crosswise: 88 - 2 = 86

(or 98 - 12 = 86: you can subtract

either way, you will always get

the same answer).

And the**24**in the answer is

just 12 x 2: you multiply vertically.

So**88 x 98 = 8624**

This is so easy it is just mental arithmetic.

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At A Party

Where there is life there is pattern

and where there is pattern there is

mathematics

and where there is pattern there is

mathematics

John D. Barrow