PSLE Answer the following.
- What is the first common multiple of 5 and 8?
- List all the common factors of 28 and 36. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 5)
(a)
Multiples of 5: 5, 10, 15, 20, 25, 30, 35, 40
Multiples of 8: 8, 16, 24, 32, 40
First common multiple: 40
(b)
Factors of 28: 1, 2, 4, 7, 14, 28
Factors of 36: 1, 2, 3, 4, 6, 9, 12, 18, 36
Common factors of 28 and 36: 1, 2, 4
Answer(s): (a) 40; (b) 1, 2, 4