Find the following values without a calculator.
For 5 and 11,
- what is the first common multiple?
- what is the second common multiple?
- what is the fourth common multiple?
(a)
Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50
Multiples of 11: 11, 22, 33, 44
First common multiple = 55
(a)
55 x 2 = 110
Second common multiple = 110
(a)
55 x 4 = 220
Fourth common multiple = 220
Answer(s): (a) 55; (b) 110; (c) 220