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89+24 change one number to a multiple of ten 90 is closest to 89 and you added by one digit adjust the other number (drop the second number by the same digit as the first number adjusted (one digit). 23 90+23=113 89+24=113

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Q: Use the make a ten strategy to find the sums and differences 89 plus 24 Change one number to a multiple of 10?
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