Worked Example 1
Adding Mixed Numbers
358 + 168
- 1Add the wholes: 3 + 1 = 4
- 2Add the fractions: 58 + 68 = 118
- 3118 is 138, so 4 + 138 = 538
Answer: 538
Florida Grade 4 Math · Fractions
MA.4.FR.2.2: Adding and Subtracting Fractions
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.2.2?
Students add and subtract fractions with like (the same) denominators, including mixed numbers and fractions greater than one. For example, 95 − 45 is 9 fifths minus 4 fifths, which is 5 fifths, or one.
Answers do not need to be simplified in Grade 4. With mixed numbers, students may need to regroup one whole into fractional parts before subtracting.
Official benchmarkAdd and subtract fractions with like denominators, including mixed numbers and fractions greater than one, with procedural reliability.
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
Subtracting With Regrouping
416 − 156
- 116 is less than 56, so regroup one whole as 66.
- 2416 = 376
- 3376 − 156 = 226
Answer: 226
Common Mistakes to Watch For
Adding the denominators
Wrong:38 + 28 = 516
The pieces are still eighths. Add the numerators only: 38 + 28 = 58.
Subtracting the smaller fraction from the larger one
Wrong:416 − 156 = 346
Regroup one whole: 376 − 156 = 226.
Helpful Math Tip
Say fractions in words while adding: "3 eighths plus 2 eighths is 5 eighths," just like 3 apples plus 2 apples.
Related Grade 4 Skills
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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.