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It means find two numbers, x and y such that, if the correct answer is a, then

x ≤ a ≤ y.

For example, for 2.45*6.78

2*6 = 12 will be smaller than the true answer while 3*7 = 21 will be bigger.

So a possible range is [12, 21].

Depening on the complexity of the expression, and your arithmetic ability, you can make the interval smaller.

For example, instead of rounding the numbers up to 3 and 7, you can do 2.5 and 6.8 and (if your mental maths is up to it) that gives the top of the range as 17 rather than 21.

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Q: What do they mean when they say give a range which includes the actual product?
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