Model method

by Minnie
(us)

One light flashes every 2 minutes and another light flashes every 7 minutes. If both lights flash together at 1 PM, what is the first time after 3PM that both lights flash together?

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Nov 21, 2016
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When do kids learn Factors & Multiples?
by: Zach

Hi Minnie,
In our Singapore syllabus, kids first learn the concept of Factors & Multiples in Primary 4 (Grade 4). However, this question is a tad harder than the usual Grade 4 questions, so it could be given to the Grade 5 and Grade 6 pupils and some high achievers in Grade 4.

Nov 21, 2016
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Singapore math
by: Minnie

Zach thank you for your help. Normally in what grade level would kids be able to do sums like this?

Nov 21, 2016
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by: Zach


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