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Thomas calculates 9Γ7 by thinking avout it as 70-7=63. Explain thomas' strategy.
4 months ago
Q:
Thomas calculates 9Γ7 by thinking avout it as 70-7=63. Explain thomas' strategy.
Accepted Solution
A:
10 x 7 = 70
1 x 7 = 7
9 x 7 = 70 - 7
9 x 7 = 63