Add several numbers (2)

Working carefully, looking for patterns to help, remembering that addition can be done in any order.

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Once the technique for adding 9 to a number has been mastered, there is no problem with adding 19, 29 or 39!

Work carefully, using patterns such as pairs of numbers that make 10, to help answer these.

Mental addition questions which get quite tricky.

Bar models can be a great help when adding mentally. Children may also want to make jottings when doing these.