4th grade adding fractions and mixed numbers

Quick answer

In 4th grade (ages 9–10), children add and subtract fractions and mixed numbers with like denominators, then multiply a fraction by a whole number. Lessons from Math Antics "Adding Mixed Numbers", Khan Academy and Math with Mr. J, with Numberock songs. Play all on repeat, or loop one worked example.

Play all on repeat

Videos in this playlist

  1. 1Decomposing a fraction visually | Fractions | Pre-Algebra | Khan AcademyDecomposing a fraction visually | Fractions | Pre-Algebra | Khan AcademyKhan AcademyPlay from here Loop
  2. 2Math Antics - Adding and Subtracting FractionsMath Antics - Adding and Subtracting FractionsmathanticsPlay from here Loop
  3. 3Adding Fractions with Like Denominators | Math with Mr. JAdding Fractions with Like Denominators | Math with Mr. JMath with Mr. JPlay from here Loop
  4. 4Adding Fractions with Common Denominators (Step by Step) | Math with Mr. JAdding Fractions with Common Denominators (Step by Step) | Math with Mr. JMath with Mr. JPlay from here Loop
  5. 5Subtracting Fractions with Like Denominators | Math with Mr. JSubtracting Fractions with Like Denominators | Math with Mr. JMath with Mr. JPlay from here Loop
  6. 6Subtracting Fractions with Common Denominators (Step by Step) | Math with Mr. JSubtracting Fractions with Common Denominators (Step by Step) | Math with Mr. JMath with Mr. JPlay from here Loop
  7. 7How to Add & Subtract Fractions with Like Denominators | Math with Mr. JHow to Add & Subtract Fractions with Like Denominators | Math with Mr. JMath with Mr. JPlay from here Loop
  8. 8Adding Fractions | Fraction Word Problems | Math with Mr. JAdding Fractions | Fraction Word Problems | Math with Mr. JMath with Mr. JPlay from here Loop
  9. 9Subtracting Fractions | Fraction Word Problems | Math with Mr. JSubtracting Fractions | Fraction Word Problems | Math with Mr. JMath with Mr. JPlay from here Loop
  10. 10Math Antics - Mixed NumbersMath Antics - Mixed NumbersmathanticsPlay from here Loop
  11. 11Mixed Numbers to Improper Fractions | Math with Mr. JMixed Numbers to Improper Fractions | Math with Mr. JMath with Mr. JPlay from here Loop
  12. 12Improper Fractions to Mixed Numbers | How to Convert | Math with Mr. JImproper Fractions to Mixed Numbers | How to Convert | Math with Mr. JMath with Mr. JPlay from here Loop
  13. 13Mixed Numbers to Improper Fractions | Lesson + PracticeMixed Numbers to Improper Fractions | Lesson + PracticeMath with Mr. JPlay from here Loop
  14. 14Improper Fractions to Mixed Numbers | Lesson + PracticeImproper Fractions to Mixed Numbers | Lesson + PracticeMath with Mr. JPlay from here Loop
  15. 15Adding mixed numbers introduction | Fractions | 4th grade | Khan AcademyAdding mixed numbers introduction | Fractions | 4th grade | Khan AcademyKhan AcademyPlay from here Loop
  16. 16Math Antics - Adding Mixed NumbersMath Antics - Adding Mixed NumbersmathanticsPlay from here Loop
  17. 17Subtracting mixed numbers introduction | Fractions | 4th grade | Khan AcademySubtracting mixed numbers introduction | Fractions | 4th grade | Khan AcademyKhan AcademyPlay from here Loop
  18. 18Math Antics - Subtracting Mixed NumbersMath Antics - Subtracting Mixed NumbersmathanticsPlay from here Loop
  19. 19Whole number and fraction multiplication concept | 4th grade | Khan AcademyWhole number and fraction multiplication concept | 4th grade | Khan AcademyKhan AcademyPlay from here Loop
  20. 20Multiplying Fractions by Whole Numbers Math Lesson for KidsMultiplying Fractions by Whole Numbers Math Lesson for KidsGenerationGeniusPlay from here Loop
  21. 21How to Multiply a Whole Number by a Fraction | Multiplying Fractions | Math with Mr. JHow to Multiply a Whole Number by a Fraction | Multiplying Fractions | Math with Mr. JMath with Mr. JPlay from here Loop
  22. 22Multiplying Whole Numbers and Fractions | Math with Mr. JMultiplying Whole Numbers and Fractions | Math with Mr. JMath with Mr. JPlay from here Loop
  23. 23How to Multiply Fractions and Whole Numbers | Lesson + PracticeHow to Multiply Fractions and Whole Numbers | Lesson + PracticeMath with Mr. JPlay from here Loop
  24. 24Add & Subtract Fractions with Like Denominators | 3rd - 4th GradeAdd & Subtract Fractions with Like Denominators | 3rd - 4th GradeNumberockPlay from here Loop
  25. 25Multiplying Fractions with Whole Numbers SongMultiplying Fractions with Whole Numbers SongNumberockPlay from here Loop

What does this 4th grade fractions unit cover?

It introduces decomposing fractions, adding and subtracting with like denominators, converting between mixed numbers and improper fractions, adding and subtracting mixed numbers, and multiplying a fraction by a whole number. By the end a child should solve 2 3/8 + 1 7/8 and 3 × 2/5.

How does RepeatWatch help with adding fractions?

Loop one worked example from A to B while your child copies it, then pause and try the next one alone. Slow regrouping steps to 0.75×, save each lesson part on keys 1–9, and use Stop after N loops to keep sessions short.

Frequently asked questions

What grade learns adding mixed numbers?

In the US, adding and subtracting fractions and mixed numbers with like denominators is usually taught in 4th grade (ages 9–10). Unlike denominators follow in 5th grade. Grade levels vary by country and school.

Why do we not add the denominators?

The denominator names the size of the pieces, like eighths. When you add 3/8 and 2/8 the pieces stay eighths, so only the count on top changes. The Math Antics and Khan Academy lessons show this with pictures.