Lesson Starter – Flat Numbers

14 10 2011

This has been a really good puzzle that learners have enjoyed and it got them thinking and engaged right at the start of a maths lesson.

A new block of flats has been built with 100 flats.

Dave has to paint the numbers from 1 to 100 on the doors.                                                                                                          

How many times will he have to paint the number 9?

A lot of learners say 11 as they do not count 90, 91, 92 and so on as they have counted up from 9, 19, 29 and their brain gets into a pattern. Then when they do realise they get to 19 and forget the number 99 has two 9’s in it. The answer is 20. This creates dicussion regarding writing information down, so that learners can visualise what they are doing.

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3 responses

15 10 2011
Gemma Holtam

Ooh I love this puzzle. I’m going to steal the idea and use it with my numeracy class. Would you mind if I referenced you and put a link to the activity on my site?

16 10 2011
juleskilburn

I don’t mind at all.

16 10 2011
Lesson starter – flat numbers | gemmateaches

[…] found this idea on Jules Shares Teaching and liked the idea so much that I thought I’d share it with you. It’s a numeracy puzzle […]

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