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# Maths Grade 9 Question Help:) watch

1. a=2^10x5^9
b=9,000,000
c=2.4x10^9
work out the lowest common multiple of a,b and c
no calculator
2. find the lcm of b and c first, I bet there's a quicker way of doing it but I did a prime factor tree for that. what I got was 7.2x10^9. then 2^10 * 5^9 is 2x10^9. do a prime factor tree with 7.2x10^9 with 2x10^9 and your lcm is 1.8*10^11. I've probably made a mistake somewhere, but that's how I would do it

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Updated: October 30, 2015
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