| 09/27/2012 3:08 pm |
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 OFFLINE | 4 times even number
Rules:
a. Write half the even number and put 0 at the end.
b. Subtract the same even number from the answer at (a).
Examples:
4 x 2; Half of 2 is 1. Put 0 at the end to form10. Subtract the 2 from the 10.
That is 10 - 2 = 8. Hence 4 x 2 = 8
4 x 4; Half of 4 is 2. Put 0 at the end to form 20. Subtract the 4 from the 20.
That is 20 - 4 = 16. Hence 4 x 4 = 16.
4 x 12; Half of 12 is 6. Put 0 at the end to form 60.
Subtract the 12 from the60. That is 60 - 12 = 48. Hence 4 x 12 = 48.
4 times odd number
Rules:
a. Write half of the odd multiplier down.
b. Reject the decimal point to get a whole number.
c. Subtract the odd multiplier from the answer at (b).
Examples:
4 x 1; Half of 1 is 0.5. Reject the decimal point to get 5.
Subtract the 1 from the 5. That is 5 - 1 = 4. Hence 4 x 1 = 4.
4 x 3; Half of 3 is 1.5. Reject the decimal point to get 15.
Subtract the 3 from the 25. That is 15 - 3 = 12. Hence 4 x 3 = 12.
4 x 13; Half of 13 1s 6.5. Reject the decimal point to get 65.
Subtract the 13 from the 65. That is 65 - 13 = 52. Hence 4 x 13 = 52.
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