PSLE Answer the following.
- What is the first common multiple of 5 and 7?
- List all the common factors of 40 and 65. Give your answers in numbers in ascending order. (Eg $(n1), $(n2), 5)
(a)
Multiples of 5: 5, 10, 15, 20, 25, 30, 35
Multiples of 7: 7, 14, 21, 28, 35
First common multiple: 35
(b)
Factors of 40: 1, 2, 4, 5, 8, 10, 20, 40
Factors of 65: 1, 5, 13, 65
Common factors of 40 and 65: 1, 5
Answer(s): (a) 35; (b) 1, 5