Trường Mở - Cộng Đồng Học Sinh Việt Nam

Tiêu đề: Vui với các con số [In trang]

Tác giả: penguin Thời gian: 27-4-2011 21:50
Tiêu đề: Vui với các con số

Amazing Mathematics Tricks

Multiply of 37 by multiplies of 3:

3 x 37 = 111

6 x 37 = 222

9 x 37 = 333

12 x 37 = 444

15 x 37 = 555

18 x 37 = 666

21 x 37 = 777

24 x 37 = 888

27 x 37 = 999

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12345679x09=111111111

12345679x18=222222222

12345679x27=333333333

12345679x36=444444444

12345679x45=555555555

12345679x54=666666666

12345679x63=777777777

12345679x72=888888888

12345679x81=999999999

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Trapeze:

1 x 9 + 2 = 11

12 x 9 + 3 = 111

123 x 9 + 4 = 1111

1234 x 9 + 5 = 11111

12345 x 9 + 6 = 111111

123456 x 9 + 7 = 1111111

1234567 x 9 + 8 = 11111111

12345678 x 9 + 9 = 111111111

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Another Trapeze:

1 x 8 + 1 = 9

12 x 8 + 2 = 98

123 x 8 + 3 = 987

1234 x 8 + 4 = 9876

12345 x 8 + 5 = 98765

123456 x 8 + 6 = 987654

1234567 x 8 + 7 = 9876543

12345678 x 8 + 8 = 98765432

123456789 x 8 + 9 = 987654321

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And another one:

0 x 9 + 8 = 8

9 x 9 + 7 = 88

98 x 9 + 6 = 888

987 x 9 + 5 = 8888

9876 x 9 + 4 = 88888

98765 x 9 + 3 = 888888

987654 x 9 + 2 = 8888888

9876543 x 9 + 1 = 88888888

98765432 x 9 + 0 = 888888888

987654321 x 9 - 1 = 8888888888

9876543210 x 9 - 2 = 88888888888

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987654321 x 09 = 08 888 888 889

987654321 x 18 = 17 777 777 778

987654321 x 27 = 26 666 666 667

987654321 x 36 = 35 555 555 556

987654321 x 45 = 44 444 444 445

987654321 x 54 = 53 333 333 334

987654321 x 63 = 62 222 222 223

987654321 x 72 = 71 111 111 112

987654321 x 81 = 80 000 000 001
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Nice one:

And finally, take a look at this symmetry:

1 x 1 = 1

11 x 11 = 121

111 x 111 = 12321

1111 x 1111 = 1234321

11111 x 11111 = 123454321

111111 x 111111 = 12345654321

1111111 x 1111111 = 1234567654321

11111111 x 11111111 = 123456787654321

111111111 x 111111111 = 12345678987654321

111.111.111 x 111.111.111 = 12.345.678.987.654.321

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This math trick will determine your birthday. Just follow the steps with a calculator and press equal after each step. Go ahead and try the trick without cheating! For a simple, online JavaScript calculator, click on the calculator button.

Add 18 to your birth month
Multiply by 25
Subtract 333
Multiply by 8
Subtract 554
Divide by 2
Add your birth date
Multiply by 5
Add 692
Multiply by 20
Add only the last two digits of your birth year
Subtract 32940 to get your birthday!

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