Word problems to solve - estimation and adding up - 4th grade math
Here are two money-related word problems for about 4th grade. The first one asks how many $0.89 toy figures you can get with $15, which would normally be solved with division, but here we solve it using doubling and estimation.
The second problem is a simple subtraction problem, BUT we find it's quicker to solve it using adding up. Mental math beats the regular subtraction algorithm here!
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See also
Round and estimate money amounts
Math Mammoth Grade 4 curriculum