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HCF & LCM · Question 7 of 63

Question 7

EasyOriginal question

What is the LCM of 0.6, 1.5 and 0.9?

0.3Correct answerYour answer0.9Correct answerYour answer4.5Correct answerYour answer9Correct answerYour answer

Show the answer and explanation

CorrectNot quiteAnswer D

Correct answer: D

All three have one decimal place, so work with 6, 15 and 9.
LCM(6, 15, 9) = $2 \times 3^2 \times 5 = 90$ .
Put back one decimal place: 9.0, that is 9.

Worth noting

4.5 is the LCM of only 0.9 and 1.5 (it is not a multiple of 0.6). 0.3 is the HCF, and forgetting to restore the decimal point gives 90.

Concept: LCM of decimals
Typical timeTypical: 45 s
Your timeYours: —

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