Estimating Answers to Calculations

Even though a calculator can perform many calculations fast and efficiently, an estimate for an answer might be a valuable check. This is accomplished by rounding each of the integers so that the calculation becomes relatively simple.

Examples:

a) Make an educated guess about the solution to 57 × 246.

There are two options:

i. 50 × 250 = 12 500

ii. 60 × 200 = 12 000

b) Calculate the solution to 6386 × 27.

6000 × 30 = 200.

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