Math Is Fun Forum

ninadbe

Member

Registered: 2009-10-24

Posts: 1

Can anyone solve this within 30 Secs using Trick?

1) 68% of 595 - 43% of 372 = ?

2) (96)² + (63)² = (?)² - (111)² - 8350

3) [(135)² ÷ 15 * 32] ÷ ? = 45 * 24

4) (739% of 383) ÷ 628 = ?

5) 814296 * 36 = ? * 96324

6) 628.306 + 6.1325 * 44.0268 = ?

7) (935.82)² = ?

8) 92.5% of 550 = ?

Plz dont use calculator, Use only Paper, Pen and Brain

Provide your solution

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Can anyone solve this within 30 Secs using Trick?

Hi;

Plz dont use calculator, Use only Paper, Pen and Brain

I don't require a brain , I have one already. Anyway. it just slows you down.

Could do 8  in my head but you need to be able to multiply in your head quickly.

10% of 550 = 55
9* 55 = 495
1/4 of 55 = 13.75
495 + 13.75 = 508.75

3) Is also easy to do in your head because there is so much cancellation;

3) [(135)² ÷ 15 * 32] ÷ ? = 45 * 24

135 / 15 = 9
135 / 45 = 3

reduced down to

27*32 / x = 24 Divide again by 24

( 9 / 8 ) *32 / x = 1

32 / 8 = 4

36 / x = 1  So x = 36

Last edited by bobbym (2009-10-25 06:30:48)

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