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Rod Measures

Stage: 2 Challenge Level: Challenge Level:3 Challenge Level:3 Challenge Level:3

Why do this problem?

This excellent problem is so very good for number awareness, reinforcement and addition and subtraction awareness.

Possible approach

Starting off in a very practical way with suitable rods would be ideal in many circumstances.

Key questions

How did you get to this solution?
I see you've not got a (suppose - 9 when using 2,3 & 5 ) can you explain that?

Possible extension

What about four rods?
Which combinations work/not work and why?

Possible support

text


The NRICH Project aims to enrich the mathematical experiences of all learners. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. More information on many of our other activities can be found here.
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NRICH is part of the family of activities in the Millennium Mathematics Project.