Addition and Subtraction
Key Stage: 1 ★★
Can you arrange 15 dominoes around this track such that each pair of adjacent ends add up to six? Can you make all the sums add to 5 or 7 instead?
This problem is useful for providing an interesting way of practising simple addition and subtraction. It can also be used to learn more about the rules for adding odd and even numbers. The problem requires a trial and improvement approach, and it is worthwile encouraging learners to articulate their method, so that it can be compared with someone else's.
This resource has comprehensive teachers' notes and resources, linked from the problem page. This includes possible approaches and key questions, as well as possible support and extensions.
The file attached is a HTML file, which, when opened, automatically redirects you to the problem on the NRICH website.
Key Stage: 1 ★★
Can you arrange 15 dominoes around this track such that each pair of adjacent ends add up to six? Can you make all the sums add to 5 or 7 instead?
This problem is useful for providing an interesting way of practising simple addition and subtraction. It can also be used to learn more about the rules for adding odd and even numbers. The problem requires a trial and improvement approach, and it is worthwile encouraging learners to articulate their method, so that it can be compared with someone else's.
This resource has comprehensive teachers' notes and resources, linked from the problem page. This includes possible approaches and key questions, as well as possible support and extensions.
The file attached is a HTML file, which, when opened, automatically redirects you to the problem on the NRICH website.
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A good idea to help children think methodically and rehearse their number bonds in KS1.
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