PARCC Estimation Sequence 3 — Questions and Answers
Question 1: A class needs 8 buses if each holds about 40 students and there are 312 students. Which estimate confirms 8 buses is enough?
- 8 × 40 = 320, more than 312 (Correct answer)
- 8 × 30 = 240, less than 312
- 8 × 50 = 400, exact
- 8 × 40 = 320, less than 312
Correct answer: 8 × 40 = 320, more than 312
8 buses hold about 320 students, which exceeds the 312 needed.
Question 2: Which of these is the best estimate for 7.92 × 4.1?
- 32 (Correct answer)
- 28
- 40
- 24
Correct answer: 32
Rounding to 8 × 4 gives 32.
Question 3: When is an UNDERestimate the safer choice?
- Deciding how many people a small bridge can safely hold (Correct answer)
- Buying enough paint for a wall
- Packing enough food for a trip
- Saving enough money for a bill
Correct answer: Deciding how many people a small bridge can safely hold
Underestimating the safe load keeps the bridge from being overloaded.
Question 4: Estimate 41% of 198 using benchmark percents.
- About 80 (Correct answer)
- About 100
- About 40
- About 120
Correct answer: About 80
40% of 200 is 80, a close benchmark estimate.
Question 5: Which sequence of estimation steps best finds about how much 5 items at \$3.89 each cost?
- Round 3.89 to 4, then 5 × 4 = 20 (Correct answer)
- Round 3.89 to 3, then 5 × 3 = 15
- Add 3.89 once, then double
- Round 5 to 6, then 6 × 3.89
Correct answer: Round 3.89 to 4, then 5 × 4 = 20
Rounding the price to \$4 and multiplying by 5 gives about \$20.
Question 6: A number rounded to the nearest ten is 350. Which value could NOT be the original number?
- 356 (Correct answer)
- 347
- 352
- 349
Correct answer: 356
356 rounds to 360, not 350.
Question 7: Estimate 8,124 ÷ 39 using compatible numbers.
- 200 (Correct answer)
- 100
- 400
- 20
Correct answer: 200
8,000 ÷ 40 gives a compatible estimate of 200.
PARCC Estimation Sequence 3
A class needs 8 buses if each holds about 40 students and there are 312 students.
Which estimate confirms 8 buses is enough?