| Sunday, May 20, 2007 |
| Squaring a 2-digit number beginning with 9 |
1. Take a 2-digit number beginning with 9.
2. Subtract it from 100.
3. Subtract the difference from the original number: this is the first part of the answer.
4. Square the difference: this is the last part of the answer.
Example:
1. If the number is 96, subtract: 100 - 96 = 4, 96 - 4 = 92.
2. The first part of the answer is 92 _ _ .
3. Take the first difference (4) and square it: 4 × 4 = 16.
4. The last part of the answer is _ _ 16.
4. So 96 × 96 = 9216.
See the pattern?
1. For 98 × 98, subtract: 100 - 98 = 2, 98 - 2 = 96.
2. The first part of the answer is 96 _ _.
3. Take the first difference (2) and square it: 2 × 2 = 4.
4. The last part of the answer is _ _ 04.
5. So 98 × 98 = 9604. |
posted by marhadi @ 6:01 AM  |
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