Why is 48 × 19 = 912 reasonable?

Q: What will my child learn in "Justify reasonableness with estimation"?

Use easy numbers to approximate the answer. This 5th Grade Math lesson builds the skill Explain methods and critique solutions with a concept card and practice.

Q: What grade level is "Justify reasonableness with estimation" for?

"Justify reasonableness with estimation" is a 5th Grade Math lesson in the Year-end synthesis unit, designed for students around ages 10-11.

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This lesson includes 20 practice questions with instant feedback. Guests can try a few for free, and signed-in learners get the full adaptive set that adjusts to their level.

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Question

Why is 48 × 19 = 912 reasonable?

Accepted Answer

Because 48 is close to 50 and 19 is close to 20, and 50 × 20 = 1,000, so 912 is close to the estimate.