Reasonable means it makes sense.
For example if I am multiplying
36 x 23
I can estimate that my answer will be close to 800 because 40 x 20 = 800.
36 rounds to 40.
23 rounds to 20.
Sure enough when I do the equation, my product is 828!
The same is true of division.
If I'm dividing 4,184 by 8 I could say...
4,000 / 8 = 500
Then when I divide, sure enough, my quotient is 523.
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