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Maths question

(9 Posts)
IslaValargeone Tue 21-Jun-11 17:30:45

How do I do this question blush I'm having a dullard moment.
Fred counts his models in groups of 5 and has 1 left over.
He then counts them in groups of 3 and also has one left over, how many does he have?

meditrina Tue 21-Jun-11 17:32:11

16, or 31, or 46

You're looking for a multiple of 3 and 5 and adding one.

LidlPrincess Tue 21-Jun-11 17:32:50

16? <i think> <i hope> lol

lovecheese Tue 21-Jun-11 17:33:25

What meditrina said. All possible answers must end in 1 or 6, ad nauseum.

IslaValargeone Tue 21-Jun-11 17:36:39

How do I explain the method to a 9 year old, when I can't get it myself?

Feenie Tue 21-Jun-11 17:38:38

Demonstrate with sweets. And eat them! Helps enormously with several mathematical concepts grin.

lovecheese Tue 21-Jun-11 17:39:57

You're looking for numbers which divide by 3 and 5, then adding one to the answer as the "remainder".

My DD is doing this ATM toogrin

IslaValargeone Tue 21-Jun-11 17:49:05

Doh! What a knob, I just wasn't seeing it, thankyou.

mrz Tue 21-Jun-11 17:51:31

Depending on the year group I would probably go with 3 X 5 + 1 as the answer (although there are lots of alternatives as meditrina pointed out)

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