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Adding near doubles - numbers less than 20

Two friends use a near doubling strategy to work out how many socks they have put into a washing machine. An animated character puts 11 socks into a washing machine. A friend arrives and puts 12 socks into another machine. To work out how many socks they have in total, 11 is doubled and 1 is added to the result to get the answer.

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Duration:

1 minute