Worked Example 1
Area Model
243 × 15
- 1Split 15 into 10 + 5.
- 2243 × 10 = 2,430
- 3243 × 5 = 1,215
- 42,430 + 1,215 = 3,645
Answer: 3,645
Florida Grade 4 Math · Number Sense and Operations
MA.4.NSO.2.2: Multiplying Up to 3 Digits by 2 Digits
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.2.2?
Students multiply a whole number with up to three digits by a whole number with up to two digits, using a method they can use reliably.
Area models and partial products break the problem apart by place value using the distributive property. Each part is easy to multiply, and the parts are added at the end.
Official benchmarkMultiply two whole numbers, up to three digits by up to two digits, with procedural reliability.
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
Partial Products
128 × 23
- 1128 × 20 = 2,560
- 2128 × 3 = 384
- 32,560 + 384 = 2,944
Answer: 2,944
Common Mistakes to Watch For
Forgetting a partial product
Wrong:128 × 23 = 2,560 + 24 = 2,584
Multiply all of 128 by 3, not just the 8: 128 × 3 = 384. Then 2,560 + 384 = 2,944.
Treating the tens digit as ones
Wrong:243 × 15: 243 × 1 = 243, and 243 + 1,215 = 1,458
The 1 in 15 means 1 ten, so multiply 243 × 10 = 2,430. The product is 3,645.
Helpful Math Tip
Estimate first (243 × 15 is about 250 × 15, or 3,750) so your child can tell if the final answer is reasonable.
Related Grade 4 Skills
Make Florida Math Practice More Fun
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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.