Estimation of Products by Rounding Factors

Try these questions

5 questions from this lesson’s quiz. Start the lesson to answer them and see the right answers.

1. 1. Estimate 63 × 48 by rounding each factor to the nearest ten.

   • A. 300
   • B. 3,000
   • C. 30,000
   • D. 2,400

2. 2. A school buys 296 exercise books at KES 52 each. Estimate the total cost by rounding each factor to the nearest ten.

   Type your answer (in KES) in the lesson.

3. 3. 26 × 38 is estimated as 30 × 40 = 1,200. Is this an overestimate or an underestimate?

   • A. Overestimate, because both factors were rounded up
   • B. Underestimate, because both factors were rounded up
   • C. Underestimate, because both factors were rounded down
   • D. It is exactly equal to the real product

4. 4. Wambui multiplies 41 × 59 and gets 24,190. She checks by rounding to the nearest ten. What does her check show?

   • A. The estimate is 2,400, so her answer is about 10 times too large
   • B. The estimate is 24,000, so her answer is reasonable
   • C. The estimate is 2,400, so her answer is too small
   • D. The estimate is 240, so her answer is 100 times too large

5. 5. What do we call an answer that is close to the exact amount but not exact, found by rounding the factors?

   Type your answer in the lesson.

More in Multiplication

• ▸Review of Whole Numbers
• ▸Mental Multiplication Strategies and Fact Families
• ▸Multiplication using Expanded Form and the Grid Method
• ▸Standard Column Multiplication
• ▸Multiplication Patterns & Sequences
• ▸Combined Operations and Real Life Problems
• ▸Division Using the Inverse Relationship with Multiplication
• ▸Dividing 4 Digit Numbers

See every Grade 6 Mathematics lesson →