Find the following values without a calculator.
For 8 and 9,
- what is the first common multiple?
- what is the second common multiple?
- what is the fourth common multiple?
(a)
Multiples of 8: 8, 16, 24, 32, 40, 48
Multiples of 9: 9, 18, 27, 36, 45
First common multiple = 72
(a)
72 x 2 = 144
Second common multiple = 144
(a)
72 x 4 = 288
Fourth common multiple = 288
Answer(s): (a) 72; (b) 144; (c) 288