Find the following values without a calculator.
For 7 and 8,
- what is the first common multiple?
- what is the second common multiple?
- what is the fourth common multiple?
(a)
Multiples of 7: 7, 14, 21, 28, 35, 42, 49
Multiples of 8: 8, 16, 24, 32, 40, 48
First common multiple = 56
(a)
56 x 2 = 112
Second common multiple = 112
(a)
56 x 4 = 224
Fourth common multiple = 224
Answer(s): (a) 56; (b) 112; (c) 224