Worked Example 1
Estimating a Product
Estimate 389 × 52.
- 1Round 389 to 400 and 52 to 50.
- 24 × 5 = 20, so 400 × 50 = 20,000
Answer: About 20,000
Florida Grade 4 Math · Number Sense and Operations
MA.4.NSO.2.5: Estimating Products and Quotients
What this Grade 4 benchmark means, worked examples, common mistakes, and a free printable worksheet.
Created by a Florida mom · Published by Tropical Learning LLC
What Is Benchmark MA.4.NSO.2.5?
Students explore multiplying and dividing multi-digit numbers using estimation, rounding, and place value. For division, dividends have up to four digits and divisors up to two digits.
Round to numbers that are easy to work with. For example, 1,380 ÷ 27 is about 1,500 ÷ 30, and 150 tens ÷ 3 tens is 50.
Official benchmarkExplore the multiplication and division of multi-digit whole numbers using estimation, rounding and place value.
On the FAST test: part of the Grade 4 reporting category Number Sense and Operations with Whole Numbers, which is about 31–37% of the test.
Worked Examples
Worked Example 2
Estimating a Quotient
Estimate 2,380 ÷ 61.
- 1Round 61 to 60. Choose a nearby number that 60 divides easily: 2,400.
- 22,400 ÷ 60 is 240 tens ÷ 6 tens = 40
Answer: About 40
Common Mistakes to Watch For
Losing track of zeros
Wrong:400 × 50 = 2,000
4 × 5 = 20, and there are three zeros in 400 and 50 together: 400 × 50 = 20,000.
Rounding to numbers that are hard to divide
Wrong:2,380 ÷ 61 ≈ 2,000 ÷ 60
Pick compatible numbers that divide evenly: 2,400 ÷ 60 = 40.
Helpful Math Tip
Before solving any multiplication or division problem, ask your child for a quick estimate. It's a great way to catch big mistakes.
Related Grade 4 Skills
Make Florida Math Practice More Fun
Help your child build math confidence with original interactive questions aligned with Florida's B.E.S.T. Mathematics Standards.
Start Practicing FreeIndependent Educational Platform. FastChomp is published by Tropical Learning LLC and is not affiliated with, sponsored by, or endorsed by the Florida Department of Education. FAST and Star assessment names are referenced for informational purposes only. FastChomp practice questions are original educational materials, not official Florida FAST assessment questions.