Fast Multiplications Trick 11
Posted by admin on June 24th, 2009Multiplying by Altering
This trick can be used when one of the multiplicants end in 9. The trick is to add 1 to the number that ends in 9 and then multiplying it with the second multiplicant.
Subtract the second multiplicant from the above result.
Have fun with the trick
19 x 5 = ??
Answer 95
Let’s try another one:
329 x 4 = ??
Time for you to try
| 39 | x | 2 | = |
|
| 59 | x | 4 | = |
|
| 79 | x | 3 | = |
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| 89 | x | 5 | = |
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| 99 | x | 7 | = |
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