Adding fractions (different denominators)
Add and subtract fractions with denominators that are multiples of the same number by finding a common denominator
Lesson
Set out your lesson
Add and subtract related-denominator fractions by renaming them in equal-sized parts.
Before teaching
Use this short check, then start teaching.
Ask for 1/2 in sixths and 2/6 + 1/6. Revisit mt_ebPelt-qAl or mt_VgOePicFYK if either renaming or same-denominator addition is uncertain. This activity check is inferred, not a change to canonical edges. Source availability is not learner mastery.
Check learner readiness directly; prerequisite availability is not attainment.
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Add and subtract related-denominator fractions by renaming them in equal-sized parts.
Add and subtract related-denominator fractions by renaming them in equal-sized parts.
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Learning resources
Extra practice links — they do not replace Gakuva’s teaching approach.
Illustrative Mathematics · Practice link — not the full lesson
Do These Add Up?
Before you open · source notes
Checking whether fraction addends make a target supports unlike-denominator addition. Not every mixed-number rewrite.
Free, no sign-in. A teacher solution is on the same page, so use the student view with your child.
Before you openAsk whether the given fractions add up to the target and explain.
Opening this link does not save learning or assess mastery.
Source, access and review notes
Public Illustrative Mathematics task page. The .html address responds HTTP 308 to this URL. An anonymous GET of this URL on 2026-11-12 returned HTTP 200 with no login or payment prompt. Where a teacher solution is present, it is on the same page as the student task; this check did not find a separate locked student view. An adult can use the student view section and should not read a solution aloud. Advertising was not observed in the fetched HTML text; that is not a browser, device, or ad-free guarantee. This is a paper or discussion task, not an automatically marked interactive game. Opening the link does not save practice or assess mastery. Diagrams on the page use missing or filename-only alt text, so they are not an accessible image equivalent. Accessibility still depends on an adult describing the picture.
Illustrative Mathematics. “Do These Add Up?.” Licensed CC BY-NC-SA 4.0. External task; Gakuva does not copy, host, embed, or redistribute it.
CC BY-NC-SA 4.0 — link only
Check understanding
- Calculate 1/3 + 1/6 by converting to sixths: 2/6 + 1/6 = 3/6 = 1/2
- Calculate 3/4 − 1/8 by converting to eighths
- Add 2/5 + 3/10 and simplify the answer
“If your child needs to add 1/3 and 1/6, can they find a common denominator and work out the total — showing their working?”
Curriculum record
- Type
- Procedural
- Subject
- Mathematics
- Domain
- Fractions
- Age range
- Ages 9–13
Standards