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Q: In a question how do you know that we have to use HCF or LCM?

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The HCF helps when reducing fractions. The LCM helps when adding or subtracting fractions.

ghadon

weighing scales

LCM is used to find the lowest common denominator in fractions HCF is used to reduce fractions to their simplest terms

2 and 20 have an HCF of 2 and an LCM of 20. You could also use 4 and 10.

Use GCF instead of HCF. 6 and 30 would be those numbers...

If you are a teacher who works with 27 pupils and 18 pupils and

Any job where you need to add or subtract fractions.

In finding the LCM or HCF of two or more numbers

Chefs, carpenters, anyone who has to add, subtract or simplify fractions.

For adding and subtracting fractions with different denominators and reducing them to their lowest terms.

to measure the tiles for our floor, if you need larger tiles so you could find by HCF and if smaller tiles you could find that by LCM

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