PSLE Answer the following.
- What is the first common multiple of 6 and 7?
- List all the common factors of 10 and 15. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 6)
(a)
Multiples of 6: 6, 12, 18, 24, 30, 36, 42
Multiples of 7: 7, 14, 21, 28, 35, 42
First common multiple: 42
(b)
Factors of 10: 1, 2, 5, 10
Factors of 15: 1, 3, 5, 15
Common factors of 10 and 15: 1, 5
Answer(s): (a) 42; (b) 1, 5