A person who is calculating the exact answer to 18 × 15 mentally starts by thinking about factors of 18. The person would finish the mental calculation by calculating:
A) 9 × 30.
B) 27 × 10.
C) 36 × 7.5.
D) 60 × 4.5.
Correct Answer:
Verified
Q4: Describe how you would mentally compute the
Q5: Show how you would mentally compute the
Q6: Show how you would mentally compute each
Q7: Give the exact answer by mental calculation,
Q8: A person can reasonably calculate the exact
Q10: For each, describe two different strategies for
Q11: Determine each calculation mentally, writing enough to
Q12: Tell how one might mentally compute each
Q13: Show how you would estimate:
A) 391 ×
Q14: Using benchmarks, find an estimate of
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