Question 2 • Pre-Algebra - MA3119 A ? Distance Learning
Parker wants to estimate the product of 12 and 4. He does the Math and gets 48. He wants to check the reasonableness of his answer, so he multiplies 10 by 4 and gets 40. Is Parker’s answer reasonable?
Answer
A
Yes, because his solution answer and estimate answer should be negative.
B
No, because only the answer to his estimation should be negative.
C
No, because 10 is less than 12, so his estimate should be greater than 48.
D
Yes, because 10 is less than 12, so his estimate should be less than 48.
Explanation
Parker’s exact product is 12 × 4 = 48. Using 10 instead of 12 gives an estimate of 10 × 4 = 40, which is less than 48 because 10 is less than 12. Since 40 is close to 48, his answer is reasonable; choice D gives the correct reasoning.
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