The highest common factor of two numbers is 13 and their least common multiple is 455. If the numbers do not differ by more than 60, what is the total of the two numbers?
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cheers!
thanks, this one was pretty quick once i remembered hcf x lcm = product of the two numbers
yeah that's the key move here, rest is just factoring 455
wait how do you use the 'differ by no more than 60' part? i got the product but then got stuck
you list the factor pairs of the product and just check which pair is close enough, the close one is the answer
is the answer 156? got that but the 14/38/40 options threw me off for a sec
same, i almost picked one of the small ones before realizing those are way too tiny
easy one but good practice for the hcf-lcm relationship 👍
What it tests
Your understanding of divisibility rules, least common multiples, and greatest common factors.
Common trap
Forgetting that 1 is not prime and that every integer divides 0.