Worked Example 1
Whole Number Times a Fraction
5 × 23
- 15 groups of 23 is 5 × 2 = 10 thirds.
- 25 × 23 = 103
Answer: 103
Florida Grade 4 Math · Fractions
MA.4.FR.2.4: Multiplying a Fraction and a Whole Number
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.FR.2.4?
Students explore multiplying a fraction by a whole number, or a whole number by a fraction, using models and number lines. The fractions are less than one.
8 × 14 means 8 groups of 14, which is 84, or 2. And 14 × 8 means one fourth of 8, which is also 2 (the commutative property). Answers do not need to be simplified.
Official benchmarkExtend previous understanding of multiplication to explore the multiplication of a fraction by a whole number or a whole number by a fraction.
On the FAST test: part of the Grade 4 reporting category Number Sense and Operations with Fractions and Decimals, which is about 31–37% of the test.
Worked Examples
Worked Example 2
A Fraction of a Whole Number
13 × 12
- 1Split 12 into 3 equal groups.
- 2Each group has 4.
Answer: 4
Common Mistakes to Watch For
Multiplying the denominator too
Wrong:4 × 25 = 820
4 groups of 2 fifths is 8 fifths. Only the numerator is multiplied: 4 × 25 = 85.
Thinking multiplying always makes a bigger number
Wrong:12 × 10 is more than 10.
Half of 10 is 5. Multiplying by a fraction less than 1 gives less than the whole number.
Helpful Math Tip
Draw groups: for 5 × 23, draw 5 circles each split into thirds, shade 2 thirds in each, and count the shaded thirds.
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.