EASY MULTIPLICATION TRICK

Posted by SHRENIK on Friday, July 24, 2009

Labels: FUN WITH NUMBERS, multiply / Comments: (0)

Method for multiplying numbers where the first figures are the same and the last figures add up to 10

FOR EG:

32 x 38 = 1216

Both numbers here start with 3 THEY ARE SAME and the last

figures (2 and 8) add up to 10

So we just multiply 3 by 4 (the next number up)

to get 12 for the first part of the answer.

And we multiply the last figures: 2 x 8 = 16 to

get the last part of the answer.

· And 81 x 89 = 7209

We put 09 since we need two figures as in all the other examples

SIMPLE TRICKS TO MULTIPLY

Posted by SHRENIK on Wednesday, July 15, 2009

Labels: FUN, FUN WITH NUMBERS, MAGIC, multiply / Comments: (0)

Multiply by 5: Multiply by 10 and divide by 2.

Multiply by 6: Sometimes multiplying by 3 and then 2 is easy.

Multiply by 9: Multiply by 10 and subtract the original number.

Multiply by 12: Multiply by 10 and add twice the original number.

Multiply by 13: Multiply by 3 and add 10 times original number.

Multiply by 14: Multiply by 7 and then multiply by 2

Multiply by 15: Multiply by 10 and add 5 times the original number, as above.

Multiply by 16: You can double four times, if you want to. Or you can multiply by 8 and then by 2.

Multiply by 17: Multiply by 7 and add 10 times original number.

Multiply by 18: Multiply by 20 and subtract twice the original number (which is obvious from the first step).

Multiply by 19: Multiply by 20 and subtract the original number.

Multiply by 24: Multiply by 8 and then multiply by 3.

Multiply by 27: Multiply by 30 and subtract 3 times the original number (which is obvious from the first step).

Multiply by 45: Multiply by 50 and subtract 5 times the original number (which is obvious from the first step).

Multiply by 90: Multiply by 9 (as above) and put a zero on the right.

Multiply by 98: Multiply by 100 and subtract twice the original number.

Multiply by 99: Multiply by 100 and subtract...