Problem Teachers' Notes Hint Solution

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

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

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?

What about four rods?

Which combinations work/not work and why?

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