| 09/27/2012 3:33 pm |
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 OFFLINE | 7 times even number
Rules:
a. Write half of the even multiplier down.
b. Double the multiplier and put it behind the answer at (a).
Examples:
7 x 2; Half of 2 is 1. Double of 2 is 4. Put 4 behind the 1 to get 14. This is your product.
7 x 6; Half of 6 is 3. Double of 6 is 12. Put the 12 behind 3 to get 312. We have entered into 3-digits and therefore we add the first 2-digits and maintain the last digit. That is 312. This gives 42. This is your answer.
7 x 48; Half of 48 is 24. Double of 48 is 96. Put the 96 behind 24 to get 2496. Here we have 4-digits and therefore we add the 2-middle digits and maintain the last digit. 2496 This means 2 13 6.
Since the sum of the 2-middle digits is more than 9, we maintain the ones- digit and the tens- digit is carried to the next column. Hence 7 x 48= 336.
7 times odd number
Rules:
a. Write half of the odd multiplier down.
b. Reject the decimal point.
c. Double the multiplier and add it to the number at (b).
Examples:
7 x 1; Half of 1 is 0.5. Reject the decimal point to get 5. Double of 1 is 2. Add the 5 and the 2 to get 7. This is your answer.
7 x 9; Half of 9 is 4.5. Reject the decimal point to get 45. Double of 9 is 18. Add the 45 and the 18 to get 63. This is your answer.
7 x 19; Half of 19 is 9.5. Reject the decimal point to get 95. Double of 19 is 38. Add the 95 and the 38 to get 133. This is your product. |
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