PSLE Answer the following.
- What is the first common multiple of 7 and 8?
- List all the common factors of 18 and 56. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 7)
(a)
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56
Multiples of 8: 8, 16, 24, 32, 40, 48, 56
First common multiple: 56
(b)
Factors of 18: 1, 2, 3, 6, 9, 18
Factors of 56: 1, 2, 4, 7, 8, 14, 28, 56
Common factors of 18 and 56: 1, 2
Answer(s): (a) 56; (b) 1, 2