Estimating math worksheet with story problems for elementary students.
A math worksheet titled "Estimating" with ten story problems requiring students to estimate answers, featuring multiple-choice options.
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Show Answer Key & Explanations
Step-by-step solution for: Estimation Multiple Choice Worksheet | Word ...
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Show Answer Key & Explanations
Step-by-step solution for: Estimation Multiple Choice Worksheet | Word ...
Here are the step-by-step solutions for each problem on the worksheet. Since these are estimation problems, we will round the numbers to make the math easier to do in your head.
1. Betty bought 36 apples... cut each into fourths.
* Round: Round 36 up to 40. "Fourths" means multiplying by 4.
* Calculate: $40 \times 4 = 160$.
* Compare: The exact answer is $36 \times 4 = 144$. Looking at the choices (180, 220, 140, 360), 140 is the closest number to our estimate and the exact answer.
* Choice: c. 140
2. Shannon’s mom filled 27 boxes with a dozen donuts each.
* Round: Round 27 up to 30. A "dozen" is 12, so round that down to 10.
* Calculate: $30 \times 10 = 300$.
* Compare: The choices are 120, 320, 49, 400. Our estimate of 300 is very close to 320. (The exact answer is $27 \times 12 = 324$).
* Choice: c. 320
3. Doug collected caterpillars: 13, 23, 15, and 31.
* Round: Round each number to the nearest ten: 10, 20, 20 (rounding 15 up), and 30.
* Calculate: $10 + 20 + 20 + 30 = 80$.
* Compare: The sum matches choice b exactly.
* Choice: b. 80
4. Nana planted 41 strawberry plants. Each grew 15 strawberries.
* Round: Round 41 down to 40. Round 15 up to 20.
* Calculate: $40 \times 20 = 800$.
* Alternative Check: If we round 15 down to 10, we get $40 \times 10 = 400$. The real answer is somewhere between 400 and 800. The exact answer is $41 \times 15 = 615$.
* Compare: 615 is much closer to 600 than it is to 400 or 800.
* Choice: c. 600
5. The US flag has 50 stars. If there were 45 flags...
* Round: Round 45 up to 50. Keep 50 as is.
* Calculate: $50 \times 50 = 2,500$.
* Compare: The choices are 1,000, 2,200, 500, 1,200. Our estimate of 2,500 is closest to 2,200. (Exact answer: $45 \times 50 = 2,250$).
* Choice: b. 2,200
6. José ordered 54 pizzas. Each had 8 slices.
* Round: Round 54 down to 50. Keep 8 as is (or round to 10). Let's try rounding 8 to 10 first: $50 \times 10 = 500$.
* Refine: Since we rounded both numbers up (well, 54 down but 8 up significantly), let's look closer. $50 \times 8 = 400$. The exact answer is $54 \times 8 = 432$.
* Compare: 432 is closest to 400.
* Choice: b. 400
7. Art class bought 73 packs of markers. Each pack had 12 markers.
* Round: Round 73 down to 70. Round 12 down to 10.
* Calculate: $70 \times 10 = 700$.
* Compare: The choices are 840, 7,300, 1,300, 120. Our estimate of 700 is closest to 840. (Exact answer: $73 \times 12 = 876$).
* Choice: a. 840
8. Bank account: Started with $\$783.50$, now have $\$420.90$. How much spent?
* Round: Round $\$783.50$ to $\$800$ (or $\$780$). Round $\$420.90$ to $\$420$ (or $\$400$).
* Calculate: Let's use $\$780 - \$420$.
* $780 - 400 = 380$
* $380 - 20 = 360$
* Compare: The result is exactly one of the options.
* Choice: c. $\$360$
9. New campers have 6 tires each. Store received 39 new campers.
* Round: Round 39 up to 40. Keep 6 as is.
* Calculate: $40 \times 6 = 240$.
* Compare: This matches choice b exactly.
* Choice: b. 240
10. Hung 90 strings of lights. Each string had 48 lights.
* Round: Keep 90 as is. Round 48 up to 50.
* Calculate: $90 \times 50$.
* $9 \times 5 = 45$
* Add the two zeros: $4,500$.
* Compare: The choices are 4,000, 100, 9,000, 6,000. Our estimate of 4,500 is closest to 4,000. (Exact answer: $90 \times 48 = 4,320$).
* Choice: a. 4,000
Final Answer:
1. c
2. c
3. b
4. c
5. b
6. b
7. a
8. c
9. b
10. a
1. Betty bought 36 apples... cut each into fourths.
* Round: Round 36 up to 40. "Fourths" means multiplying by 4.
* Calculate: $40 \times 4 = 160$.
* Compare: The exact answer is $36 \times 4 = 144$. Looking at the choices (180, 220, 140, 360), 140 is the closest number to our estimate and the exact answer.
* Choice: c. 140
2. Shannon’s mom filled 27 boxes with a dozen donuts each.
* Round: Round 27 up to 30. A "dozen" is 12, so round that down to 10.
* Calculate: $30 \times 10 = 300$.
* Compare: The choices are 120, 320, 49, 400. Our estimate of 300 is very close to 320. (The exact answer is $27 \times 12 = 324$).
* Choice: c. 320
3. Doug collected caterpillars: 13, 23, 15, and 31.
* Round: Round each number to the nearest ten: 10, 20, 20 (rounding 15 up), and 30.
* Calculate: $10 + 20 + 20 + 30 = 80$.
* Compare: The sum matches choice b exactly.
* Choice: b. 80
4. Nana planted 41 strawberry plants. Each grew 15 strawberries.
* Round: Round 41 down to 40. Round 15 up to 20.
* Calculate: $40 \times 20 = 800$.
* Alternative Check: If we round 15 down to 10, we get $40 \times 10 = 400$. The real answer is somewhere between 400 and 800. The exact answer is $41 \times 15 = 615$.
* Compare: 615 is much closer to 600 than it is to 400 or 800.
* Choice: c. 600
5. The US flag has 50 stars. If there were 45 flags...
* Round: Round 45 up to 50. Keep 50 as is.
* Calculate: $50 \times 50 = 2,500$.
* Compare: The choices are 1,000, 2,200, 500, 1,200. Our estimate of 2,500 is closest to 2,200. (Exact answer: $45 \times 50 = 2,250$).
* Choice: b. 2,200
6. José ordered 54 pizzas. Each had 8 slices.
* Round: Round 54 down to 50. Keep 8 as is (or round to 10). Let's try rounding 8 to 10 first: $50 \times 10 = 500$.
* Refine: Since we rounded both numbers up (well, 54 down but 8 up significantly), let's look closer. $50 \times 8 = 400$. The exact answer is $54 \times 8 = 432$.
* Compare: 432 is closest to 400.
* Choice: b. 400
7. Art class bought 73 packs of markers. Each pack had 12 markers.
* Round: Round 73 down to 70. Round 12 down to 10.
* Calculate: $70 \times 10 = 700$.
* Compare: The choices are 840, 7,300, 1,300, 120. Our estimate of 700 is closest to 840. (Exact answer: $73 \times 12 = 876$).
* Choice: a. 840
8. Bank account: Started with $\$783.50$, now have $\$420.90$. How much spent?
* Round: Round $\$783.50$ to $\$800$ (or $\$780$). Round $\$420.90$ to $\$420$ (or $\$400$).
* Calculate: Let's use $\$780 - \$420$.
* $780 - 400 = 380$
* $380 - 20 = 360$
* Compare: The result is exactly one of the options.
* Choice: c. $\$360$
9. New campers have 6 tires each. Store received 39 new campers.
* Round: Round 39 up to 40. Keep 6 as is.
* Calculate: $40 \times 6 = 240$.
* Compare: This matches choice b exactly.
* Choice: b. 240
10. Hung 90 strings of lights. Each string had 48 lights.
* Round: Keep 90 as is. Round 48 up to 50.
* Calculate: $90 \times 50$.
* $9 \times 5 = 45$
* Add the two zeros: $4,500$.
* Compare: The choices are 4,000, 100, 9,000, 6,000. Our estimate of 4,500 is closest to 4,000. (Exact answer: $90 \times 48 = 4,320$).
* Choice: a. 4,000
Final Answer:
1. c
2. c
3. b
4. c
5. b
6. b
7. a
8. c
9. b
10. a
Parent Tip: Review the logic above to help your child master the concept of multiple choice addition worksheet.
