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Use the hundred square to find 10 more than 81.
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Finding 10 more than 81 is the same as saying 81 add 10.
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One way to do this would be to start at 81 and count forward 10 squares on the hundred square: one, two, three, four, five, six, seven, eight, nine, 10.
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81 add 10 is 91.
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Did you notice that 91 is below 81 on the hundred square?
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This is another way to find 10 more than a number on a hundred square.
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The number below a given number on a hundred square is always 10 more.
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10 more than 81 is 91.