The 8 Fact
The 8 Fact
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3.OA.7
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Use the 5-fact to efficiently access the 8-fact, e.g.
n x 5 + n + n + n = n x 8
(n x 5) + (n x 3) = n x 8
Use the 10-fact to efficiently access the 8-fact, e.g.
n x 10 - n - n = n x 8
(n x 10) - (n x 2) = n x 8