Estimate the sum or difference. Use the benchmarks 0, one-half, and 1.
Start Fraction 23 over 40 End Fraction – Start Fraction 9 over 30 End Fraction
A. 0
B. 1
C. one-half
D. Start Fraction 14 over 70 End Fraction
Answer: C. one-half
Start Fraction 23 over 40 End Fraction – Start Fraction 9 over 30 End Fraction
A. 0
B. 1
C. one-half
Answer: C. one-half