PSLE Answer the following.
- What is the first common multiple of 7 and 11?
- List all the common factors of 27 and 42. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 7)
(a)
Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77
Multiples of 11: 11, 22, 33, 44, 55, 66, 77
First common multiple: 77
(b)
Factors of 27: 1, 3, 9, 27
Factors of 42: 1, 2, 3, 6, 7, 14, 21, 42
Common factors of 27 and 42: 1, 3
Answer(s): (a) 77; (b) 1, 3