catkat7hecarencisu catkat7hecarencisu

11-11-2016
Mathematics

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Use algebra tiles to find the difference. Let one white tile equal +1 and one black tile equal _1.

10 _ 9

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scme1702 scme1702

17-11-2016

We draw 10 white tiles.
Then we shade in 9 of them.
We count the remaining tiles to get the answer, which is 1.

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nobillionaireNobley nobillionaireNobley

18-11-2016

There will be 10 white tiles and 9 black tiles which will cancel out 9 white tiles remaining 1 white tile.
Therefore, 10 - 9 = 1

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