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What is a number line? - Counting and ordering : Video playlist - BBC Bitesize
A number line can be used to add and subtract.
↗ https://www.bbc.co.uk/bitesize/topics/zwp9fdm/watch/zw3qrmnA number line can be used to add and subtract.
↗ https://www.bbc.co.uk/bitesize/topics/zwp9fdm/watch/zw3qrmn