Tell how one might mentally compute each calculation.
A) 25 × 104
B) 25% of 104
C) 200% of 104
Correct Answer:
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Q7: Give the exact answer by mental calculation,
Q8: A person can reasonably calculate the exact
Q9: A person who is calculating the exact
Q10: For each, describe two different strategies for
Q11: Determine each calculation mentally, writing enough to
Q13: Show how you would estimate:
A) 391 ×
Q14: Using benchmarks, find an estimate of
Q15: Joe Blue was estimating 92 × 31.
Q16: For each calculation, mentally obtain an estimate
Q17: Is 40 ÷ 1.99 less than, equal
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