7
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Prior Strategy: Learn your times tables.
Strategy when question is presented:
Retrieve from memory: 49 is in the 7 times table, but maybe you cannot remember how many times.
7 * 5 is 35 so need a bigger multiple.
7 * 6 = 7 more than 35 = 42. Better but not enough.
7 * 7 = 7 more than 42 = 49. Good.
So, if 7*7 = 49 then 49/7 = 7
8 times 9= 72
4/8
You could break down the corresponding elements. So you could add the 600 and the 200 giving 800. You could then add the 90 and the 2, giving 92. Then add the 800 and the 92, giving 892.
mass divided by volume
11.65