Mathematics, 18.02.2020 05:30 lizzyhearts

For the particial sums above billy said 20 plus 90 is 110 plus 200 equals 310. Is billy correct ? Use models properties or equationd to represent and explain your thinking

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For the particial sums above billy said 20 plus 90 is 110 plus 200 equals 310. Is billy correct ? Us...

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