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Use Estimation to Detect an Error
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PPM.163 Use Estimation to Detect an Error
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A student says 7/8 of 48 plus 12 equals 454. Which estimate best shows the result is unreasonable?
A
Because 7/8 is close to 1, the result should be close to 480.
B
7 × 48 is 336, and adding 12 makes a number near 454.
C
Adding 12 to a fraction result should place a 12 at the end of the number, under the stated conditions.
D
7/8 of 48 is almost all of 48, about 42; adding 12 gives about 54, not 454.
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