Tuesday, January 12, 2010
To quickly multiply by four, double the number and then double it again.
Often this can be done in your head.
Multiply By 4
Posted by Free Math Tips at 11:26 AM
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January
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- Mathematical trick: multiply by powers of 2
- Mathematical trick: multiply a number by 5, 25 or 125
- Mathematical trick: multiply by 11
- Mathematical trick: multiply a number by 9, 99 or 999
- Dividing by 14
- Dividing by 13
- Dividing by 11-2
- Dividing by 11
- Dividing by 8
- Dividing by 7
- Math Games & Lessons : Math Tricks With Numbers
- A way to remember the Entire Unit Circle for Trigo...
- Fun Math Trick! Squaring Numbers Near 100
- Quick Math Tricks: Thinking of Numbers as Blocks
- Understanding Math : Math Tips & Tricks
- Math Tips and Tricks- Multiply by 11 and 111
- Multiply Up to 20X20 In Your Head
- The 11 Rule
- Finger Math: 9X Rule
- Square a 2 Digit Number Ending in 5
- Square 2 Digit Number: UP-DOWN Method
- Multiply By 4
- Multiply By 5
- The 11 Rule Expanded
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