Find the following values without a calculator.
For 5 and 6,
- 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 6: 6, 12, 18, 24, 30, 36, 42, 48
First common multiple = 30
(a)
30 x 2 = 60
Second common multiple = 60
(a)
30 x 4 = 120
Fourth common multiple = 120
Answer(s): (a) 30; (b) 60; (c) 120