Multiples of 3
3 times even number
Rules:
a. Write half of the multiplier and put 0 at the end.
b. Double the multiplier and subtract it from rule (a).
Examples:
3 x 2: Half of 2 is 1. Put 0 at the end to form 10. Take away twice
the multiplier. Twice of 2 is 4. 10 - 4 = 6. 3 x 2 = 6.
3 x 12: Half of 12 is 6. Put 0 at the end to form 60. Take away twice
the multiplier. Twice of 12 is 24. 60 - 24 = 36. 3 x 12 = 36
3 times odd number
Ruels:
a. Write half of the multiplier (odd number divided by 2 you get
decimal fraction).
b. Ignore the decimal point and write the number down.
c. Double the multiplier and subtract it from rule (b).
Examples:
3 x 1; Half of 1 is 0.5. Ignore the decimal point to gget 5. Double of 1 is 2. Therefore 5 - 2 = 3.
3 x 1 = 3.
3 x 19; Half of 19 is 9.5. Ignore the decimal point to get 95. Double
of 19 is 38. Therefore 95 - 38 = 57. 3 x 19 = 57.
USE THE CALCULATOR FOR YOUR CALCULATION
CONSTRUCTED BY INNUSAH SAMUEL
