Here are some funny math interesting facts. All the below tricks are based around the sequential manipulation of the numbers being used for input and output.
Sequential Inputs of numbers with 8
|
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 |
Sequential 1's with 9
|
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 |
123456789 x 9 + 10 = 1111111111 |
Sequential 8's with 9
|
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 |
Numeric Palindrome with 1's |
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 |
Without 8
|
12345679 x 9 = 111111111 |
12345679 x 18 = 222222222 |
12345679 x 27 = 333333333 |
12345679 x 36 = 444444444 |
12345679 x 45 = 555555555 |
12345679 x 54 = 666666666 |
12345679 x 63 = 777777777 |
12345679 x 72 = 888888888 |
12345679 x 81 = 999999999 |
Sequential Inputs of 9
|
9 x 9 = 81 |
99 x 99 = 9801 |
999 x 999 = 998001 |
9999 x 9999 = 99980001 |
99999 x 99999 = 9999800001 |
999999 x 999999 = 999998000001 |
9999999 x 9999999 = 99999980000001 |
99999999 x 99999999 = 9999999800000001 |
999999999 x 999999999 = 999999998000000001 |
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Sequential Inputs of 6
|
6 x 7 = 42 |
66 x 67 = 4422 |
666 x 667 = 444222 |
6666 x 6667 = 44442222 |
66666 x 66667 = 4444422222 |
666666 x 666667 = 444444222222 |
6666666 x 6666667 = 44444442222222 |
66666666 x 66666667 = 4444444422222222 |
666666666 x 666666667 = 444444444222222222 |
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