PSLE Answer the following.
- What is the first common multiple of 3 and 8?
- List all the common factors of 33 and 42. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 3)
(a)
Multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24
Multiples of 8: 8, 16, 24
First common multiple: 24
(b)
Factors of 33: 1, 3, 11, 33
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
Common factors of 33 and 42: 1, 3
Answer(s): (a) 24; (b) 1, 3