Estimating Products for 4th Grade
To estimate a product, round each factor to its leading digit and multiply. The estimate tells you the size of the answer, which is how you catch a misplaced digit in your exact calculation. The examples below show when rounding both factors overshoots, with practice.
DETAILED EXPLANATION
To estimate a product, round each factor to a number that is easy to multiply (e.g., nearest ten or hundred), then multiply. Example: 48 × 62 ≈ 50 × 60 = 3,000.
WORKED EXAMPLES WITH STEP BY STEP SOLUTIONS
Example 1
Estimate 73 × 28.
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Solutions:
Step 1: Apply the concept from the lesson above.
Step 2: Carry out the operation or reasoning.
Answer: 73 ≈ 70, 28 ≈ 30. 70 × 30 = 2,100.
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