Substituting into formulae
Put numbers into a formula such as P = V × I and work out the answer.
Planned. This module is part of the plan and is not written yet.
Why it matters
Solar power runs on a formula, P = V × I (power equals voltage times current); putting numbers into it tells you whether a panel can run a lamp or charge a phone.
Draft outline · in review- For
- Level 7–8 · JSS 1 to JSS 2
- Inside
- 5 lessons and a test · about 60 minutes
- Topic
- Formulae · 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: What a formula is
A rule that connects quantities, written with letters.
Explain10 min, from minute 0
Lesson 2: Substituting
Put numbers into P = V × I and A = l × w and work out the answer.
Worked example15 min, from minute 10
Lesson 3: Formulae and the order of operations
Evaluate formulae such as v = u + at, multiplying before adding.
Practice15 min, from minute 25
Lesson 4: Writing formulae
Turn 'the cost is ₦50 per kilogram plus ₦100 delivery' into C = 50m + 100.
Worked example10 min, from minute 40
Lesson 5: Review
Mixed questions, with feedback on each.
Review10 min, from minute 50
End-of-module test
Substitute values into formulae, including ones that need the order of operations, and write formulae from descriptions in words.
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
A cyclist speeds up. Use v = u + at to find her speed v when u = 4 m/s, a = 0.5 m/s² and t = 6 s.
Work it out on paper first, then show the answer and mark it yourself.
Particulars
What a learner can do after it
- Substitute values into a formula and evaluate it.
- Write a formula from a description in words.
Needs first
Level
Level 7–8 · JSS 1 to JSS 2
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
None drafted yet.
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%.
University courses it previews
Mathematics, Engineering, Computer Science, Economics, Physics
On these pathways
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-ARI-OPS-01Adding and subtractingMaths · Primary 1 to Primary 3 (Level 1–3) · Planned
- MA-ARI-OPS-02Multiplication as equal groupsMaths · Primary 2 to Primary 3 (Level 2–3) · Sample lesson in the demo Needs Adding and subtracting (required).Try the sample lesson: Multiplication as equal groups
- MA-ARI-OPS-03Division as sharing and groupingMaths · Primary 3 to Primary 4 (Level 3–4) · Planned Needs Multiplication as equal groups (required).
- MA-ARI-OPS-04Multiplying and dividing togetherMaths · Primary 3 to Primary 4 (Level 3–4) · Planned Needs Division as sharing and grouping (required).
- MA-ARI-ORD-01Order of operationsMaths · Primary 5 to Primary 6 (Level 5–6) · Planned Needs Multiplying and dividing together (required).
- MA-ALG-EXP-01Letters for numbersMaths · Primary 6 to JSS 1 (Level 6–7) · Planned Needs Order of operations (required).
- MA-ALG-FRM-01Substituting into formulaeMaths · JSS 1 to JSS 2 (Level 7–8) · Planned · the destination Needs Letters for numbers (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.