Adding and subtracting with the same denominator
Add and subtract fractions that share a denominator.
Planned. This module is part of the plan and is not written yet.
Why it matters
If Ngozi waters 3/8 of the garden in the morning and 4/8 in the evening, adding the fractions tells her how much is done and how much is still dry.
Draft outline · in review- For
- Level 4–5 · Primary 4 to Primary 5
- Inside
- 5 lessons and a test · about 60 minutes
- Topic
- Fraction operations · foundation, 1 of 4
Inside the module.
5 lessons in order, about 60 minutes in all, then a short test. Learners go at their own pace; the minutes are a guide, not a timetable.
Draft outline · in review
Lesson 1: Adding equal-sized parts
With the same denominator, add the numerators and keep the size of the parts.
Explain15 min, from minute 0
Lesson 2: Subtracting
Take away parts of the same size, such as 7/9 − 4/9.
Worked example10 min, from minute 15
Lesson 3: Answers bigger than one
Turn an answer like 7/5 into the mixed number 1 2/5.
Worked example15 min, from minute 25
Lesson 4: Practice
Add and subtract fractions in garden, recipe and journey stories.
Practice15 min, from minute 40
Lesson 5: Review
Mixed questions, with feedback on each.
Review5 min, from minute 55
End-of-module test
Add and subtract fractions with the same denominator, and write answers greater than one as mixed numbers.
Mastered at 85% or more. Retake it until you pass; nothing is lost, and each try gives feedback.
Already know it? A Challenge Test (planned) clears the whole module: 90% overall, no objective below 75%.
Last stageafter about 60 min
Practicalities
Draft outline · in reviewBuilt to run offline
Planned to run on the Lantern's own computer, with no internet needed.
Languages
Planned first in English; every module aims to reach all of the Lantern's languages.
Try a question.
One question from the module, as a learner would meet it. Have a go, then open the worked solution a step at a time.
Draft outline · in review
Work out 5/7 + 4/7. Write the answer as a mixed number.
Work it out on paper first, then show the answer and mark it yourself.
Particulars
Where it sits
Maths · Fractions, decimals and percentages · Fraction operations
What a learner can do after it
- Add and subtract fractions with the same denominator.
- Write answers greater than one as mixed numbers.
Needs first
Level
Level 4–5 · Primary 4 to Primary 5
Level mappings are approximate. A qualified teacher or lecturer in each country must check them before they appear in the app.
Difficulty for its level
1 of 4 · Foundation
Time
About 60 minutes
Alignments
- Aligned to Common Corepartial · in review4.NF.B.3
Alignment in review until a qualified teacher or lecturer checks it. No exam body, university or vendor endorses us; learners still sit the real exam.
Challenge Test
Planned: a Challenge Test to prove you know it and skip it. Pass at 90% overall, with no objective below 75%.
The route here.
Everything this module builds on, drawn as a route from its foundations. Solid lanes must be mastered first, or cleared by a Challenge Test; dashed lanes are suggestions that never lock anything.
- MA-FDP-FRS-01Parts of a wholeMaths · Primary 2 to Primary 3 (Level 2–3) · Sample lesson in the demoTry the sample lesson: Parts of a whole
- MA-FDP-FRS-03Fractions on a number lineMaths · Primary 3 to Primary 4 (Level 3–4) · Planned Needs Parts of a whole (required).
- MA-FDP-OPS-01Adding and subtracting with the same denominatorMaths · Primary 4 to Primary 5 (Level 4–5) · Planned · the destination Needs Fractions on a number line (required).
Help light the room where this is learned.
Every route on this map starts in a classroom with 24 stations, a tutor that works offline and a facilitator upstairs. Four are planned and waiting for light.