Yes, there would. For example, how high a ladder do you need to reach the roof? Answer is the difference between the roof height and your reach.
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it would not be a good time to estimate mixed numbers is when both of the fractions are not a mixed number
An estimated difference is when you can't be bothered to calculate the exact number, so you simplify things a bit. An estimate for 800-something - 400-something would be 400.
I would use 40 for the 38 and 50 for the 51. 90 would be my estimate.
900 would be a fair estimate
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