Tayng's answer to Owen's Secondary 1 Maths Singapore question.
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There
Date Posted:
2 months ago
I’m sorry , but i still don’t understand??
e.g 1st number = 3 x 7 x (“2”) why must be multiple by 2, and where does the 2 come from??? As my equation only have 3x7
e.g 2nd number .
why The LCM = 3x7x 5power2 ( why use 5 ?, why we didn’t choose 2 instead?) ? ?
Why it can not be LCM = 2x3x7. ???
Please help to explain,, i m so confused
Cause i thought for HCF we chose multiply common prime factor with the lower power
But
For LCM we chose multiply prime factor with the highest power
??
e.g 1st number = 3 x 7 x (“2”) why must be multiple by 2, and where does the 2 come from??? As my equation only have 3x7
e.g 2nd number .
why The LCM = 3x7x 5power2 ( why use 5 ?, why we didn’t choose 2 instead?) ? ?
Why it can not be LCM = 2x3x7. ???
Please help to explain,, i m so confused
Cause i thought for HCF we chose multiply common prime factor with the lower power
But
For LCM we chose multiply prime factor with the highest power
??
Misconception!!
HCF you choose common factors first
Then out of the common factors you choose the highest power
LCM you choose all factors
Then out of all factors you choose the lowest power
HCF you choose common factors first
Then out of the common factors you choose the highest power
LCM you choose all factors
Then out of all factors you choose the lowest power
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