MATHS TRICKS- III

click here to visit part 2
Multiplying by 12 shortcut
So how does the 12's shortcut work?
Let's take a look.

12 X 7
the first thing is to always multiply the 1 of the twelve by the number we are multiplying
by, in this case 7. So 1 X 7 = 7.

Multiply this 7 by 10 giving 70.

Now multiply the 7 by the 2 of twelve giving 14. Add this to 70 giving 84.
Therefore 7 X 12 = 84

Let's try another:

17 X 12
Remember, multiply the 17 by the 1 in 12 and multiply by 10
(Just add a zero to the end):

1 X 17 = 17, multiplied by 10 giving 170.

Multiply 17 by 2 giving 34.

Add 34 to 170 giving 204.

So 17 X 12 = 204

lets go one more

24 X 12

Multiply 24 X 1 = 24. Multiply by 10 giving 240.

Multiply 24 by 2 = 48. Add to 240 giving us 288

24 X 12 = 288 (these are Seriously Simple Sums to do aren’t they?!)


Converting Kilos to pounds
In this section you will learn how to convert Kilos to Pounds, and Vice Versa.

Let’s start off with looking at converting Kilos to pounds. 86 kilos into pounds:

Step one, multiply the kilos by TWO.

To do this, just double the kilos.
86 x 2 = 172

Step two, divide the answer by ten.

To do this, just put a decimal point one place in from the right.
172 / 10 = 17.2

Step three, add step two’s answer to step one’s answer.

172 + 17.2 = 189.2
86 Kilos = 189.2 pounds

Let’s try:
50 Kilos to pounds:

Step one, multiply the kilos by TWO.

To do this, just double the kilos.
50 x 2 = 100

Step two, divide the answer by ten.

To do this, just put a decimal point one place in from the right.
100 / 10 = 10

Step three, add step two’s answer to step one’s answer.
100 + 10 = 110
50 Kilos = 110 pounds
click here to visit part 4