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4.6 Use Rounding to Estimate and Judge Reasonableness Worksheet

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Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Grade 4 Math worksheet provides structured practice on 4.6 Use Rounding to Estimate and Judge Reasonableness. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

Given an exact answer and an estimate from rounding, select whether the exact answer is reasonable and choose the best explanation. (CCSS 4.NBT.A.3; CCSS 4.OA.A.3; FL B.E.S.T. MA.4.NSO.2.5)

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Grade 4

Subject

Math

Domain

Math Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related 4.6 Use Rounding to Estimate and Judge Reasonableness skill assessments:

Problem 1Difficulty: Mastery

At the book fair, each kit has 950 small toy robots and 319 large toy robots. There are 29 kits, and then 4,525 extra toy robots are donated. Find the total toy robots. Student's answer: 40,472 Rounded estimate: 29, 950→1,000, 319→300, 4,525→5,000; 29 x (1,000 + 300) + 5,000 = 42,700 Is the student's answer reasonable? Choose the best explanation.

ANo. 40,472 is not exactly the estimate 42,700, so it cannot be reasonable.

BNo. The estimate is 42,700 and 40,472 is different, so the answer must be wrong.

CNo. Because rounding always makes answers smaller, so any smaller number is reasonable.

DYes. Rounding can make the estimate a little higher or lower, and 40,472 is still close to 42,700.

Solution & Explanation:Rounded estimate: 29, 950→1,000, 319→300, 4,525→5,000; 29 x (1,000 + 300) + 5,000 = 42,700. Then compare the estimate 42,700 to the student's answer 40,472. They are close, so the student's answer is reasonable.

Problem 2Difficulty: Mastery

At the car wash, each kit has 606 small straws and 356 large straws. There are 44 kits, and then 12,578 extra straws are donated. Find the total straws. Student's answer: 115,302.6 Rounded estimate: 44, 606→600, 356→400, 12,578→13,000; 44 x (600 + 400) + 13,000 = 57,000 Is the student's answer reasonable? Choose the best explanation.

AYes. 115,302.6 and 57,000 are both large numbers, so the student's answer is reasonable.

BYes. The estimate is 57,000, and any answer near that place value is reasonable.

CNo. Even with rounding, the exact answer should be near 57,000; 115,302.6 is too far away.

DYes. Because the estimate 57,000 is rounded, the exact answer must be exactly 57,000.

Solution & Explanation:Rounded estimate: 44, 606→600, 356→400, 12,578→13,000; 44 x (600 + 400) + 13,000 = 57,000. Then compare the estimate 57,000 to the student's answer 115,302.6. They are not close, so the student's answer is not reasonable.

Problem 3Difficulty: Mastery

At the computer lab, there are 50 teams. Each team planned 5,437 flashlights, but 846 were canceled. Find the total number of flashlights that still happen. Student's answer: 224,950 Rounded estimate: 50, 5,437→5,400, 846→800; 50 x (5,400 − 800) = 230,000 Is the student's answer reasonable? Choose the best explanation.

ANo. 224,950 is not exactly the estimate 230,000, so it cannot be reasonable.

BYes. Rounding can make the estimate a little higher or lower, and 224,950 is still close to 230,000.

CNo. The estimate is 230,000 and 224,950 is different, so the answer must be wrong.

DNo. Because the estimate 230,000 is rounded, the exact answer must be exactly 230,000.

Solution & Explanation:Rounded estimate: 50, 5,437→5,400, 846→800; 50 x (5,400 − 800) = 230,000. Then compare the estimate 230,000 to the student's answer 224,950. They are close, so the student's answer is reasonable.

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Frequently Asked Questions

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QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Grade 4 Math students. It aligns with educational standard 4.6 (Use Rounding to Estimate and Judge Reasonableness).