Doubling and halving

The strategy of doubling and halving is fun and is very good for making equations smaller and easier.

e.g 200 x 187 = 100 x 374 = 37400
Here I doubled 187 and halved 200 to make 37400.

K Z

An amazing maths strategy

Doubling and Halving etc, is a useful mental strategy if you are horrible at keeping numbers in your buzzing brain. If you don't like Einstien formulas to find out such multiplication problems such as 66x6, then this is for you! All you do is divide one by 6 and times the other by 6 etc. and wolah! It instantly becomes 11x 36 or 396 x 1! Splendid! You don't have to scribble on ten thousand pieces of paper to work it out.
It can be a pain sometimes espically if it goes off into 3 digits but I rate this method 80 out of
100!

S W

Doubling , halving and more....

I like this strategy because it gets your brain pumping. It is easy to do really hard questions and it gets stuck in your brain. I like the way you can double and halve numbers to make the equation easier. And, you can also triple and third as well. This strategy makes it much easier.

N.C

The strategy of doubling and halvng

The strategy of doubling and halving is good for high levelled multiplication problems.

e.g. 20 x 97= 10 x 194=1940 . I have halved 10 and doubled 97 to make 10 x 194 (much easier)

Doubling and halving is only good for problems that have a number that can be halved. It is also the same thing for tripling and thirding and quadrupling and quartering etc.

Ab K

Maths strategy

Doubling, halving, tripling and thirding and more is an understandable strategy. I would recommend this nice and easy strategy to other people. Its not complicated and once you get the hang of it you'll say, "Boy that was soo much fun!" Sometimes it can get a bit hard, when you go up to higher numbers, and you don't know what to triple or third. When you double and halve, the numbers get easier and even, and it's easier to figure out the solution!

J T