Arrange the numbers 1 to 5 in the brown squares so that the total of the row is the same as the total of the column
How many different ways are there of doing this?
What do you notice about the different ways of solving this problem?
Can you prove that the centre number has to be odd?
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"I copy the pages onto a flipchart on the electronic whiteboard. That way the class can take their time at it, as we use it as a half-hour settling in activity rather than a starter to the numeracy lesson proper. I use it with a Year 4 clsas, so a lot of the starters are too advanced for them. However, they have got on well with the ones we have used. Would be delighted to see similar written specically for KS2!" Mairi Salters, Burwell VC Primary School
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Keywords: Starter
| Arithmetic
| Investigations
| Puzzles
Thursday, June 21, 2007
Good, achieved the results I required
Satisfactory
Didn't really capture the interest of the students
Not for me! I wouldn't use this type of activity.
This starter has scored a mean of 3.9 out of 5 based on 83 votes.
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Answers
The answers to this starter can be found on a different page so that you can give students access to this page to work on. We're guessing the students haven't studied calculus yet so here's the secret way the teacher can get to the answers. Differentiate the expression below and type the answer here:
Leave no spaces in what you type.
6x2+2x-7
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