More addition of three numbers

Look for pairs of numbers that make 20 in these addition questions.

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Adding 9 or 11 to 3-digit numbers by adding 10 and adjusting.

Use the technique for adding 9 for adding 19, 29, 39 etc. This makes hard looking calculations quite easy.

Try these addition of three, single digit numbers. Remember to look for pairs that make 10.

Practice with helping to know pairs of numbers that make 100.

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