Estimating Sums and Differences for 4th Grade
To estimate a sum or difference, round each number to the same place and then add or subtract. Rounding to a larger place is faster but less accurate, and the estimate is mainly there to tell you whether your exact answer is reasonable. Practice problems follow.
DETAILED EXPLANATION
Estimating means finding a number close to the exact answer. Round each number to the nearest ten, hundred, or thousand, then add or subtract the rounded numbers. Estimates help check if an exact answer is reasonable.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Estimate 3,478 + 2,193 by rounding to the nearest hundred.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 3,478 ≈ 3,500; 2,193 ≈ 2,200. 3,500 + 2,200 = 5,700.
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