Mental Math help please
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Mental Math help please

[From: ] [author: ] [Date: 11-10-12] [Hit: ]
Marco-Mental math is referred to calculations that are done in a students head without the guidance of pencil and paper, calculators or other aids. Mental math is often used as a way to calculate and estimate quickly, using math facts that a student has committed to memory, such as multiplication, division or doubles facts.......
Could anyone explain mental math to me plz, im not lookin for answers but here is one of my problems

Use mental math to simplify each expression
10 x 72 x 5 x 2

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5X2 is 10, and to multiply by 10 means to add a 0 at the end. So 72 times 10 times 10 means you add two zeros at the end of 72.

Hope this helps,
Marco

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Mental math is referred to calculations that are done in a student's head without the guidance of pencil and paper, calculators or other aids. Mental math is often used as a way to calculate and estimate quickly, using math facts that a student has committed to memory, such as multiplication, division or doubles facts.

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i read a good book by an Australian called speed mathematics it's really good n u can download a pdf online for free. Google it n u will find it!
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