Find the following values without a calculator.
For 7 and 11,
- 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 11: 11, 22, 33, 44
First common multiple = 77
(a)
77 x 2 = 154
Second common multiple = 154
(a)
77 x 4 = 308
Fourth common multiple = 308
Answer(s): (a) 77; (b) 154; (c) 308