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MATATAG Key Stage 3 · entry year Term 1 · Week 7 · Number & Algebra

Grade 7 Mathematics

Percentage increase and decrease — CG competency 7. A complete, classroom-ready artifact set, verified against the official curriculum guide. Everything here runs offline.

Focus competency
Solve problems involving (a) percentage increase and (b) percentage decrease (CG 7)
Session length
45 minutes
Content domain
Number and Algebra
Needs internet?
No — not at any point
The idea this week has to overturn A shirt costs ₱100. The price goes up 20%, then down 20%. Almost every class — and almost every adult — says ₱100. It is ₱96, because the second 20% is taken of ₱120, not of ₱100. Day 1 does not announce that. It puts ₱20 and ₱24 side by side on the board and asks why they differ.

For the teacher — six documents

Planning, assessing and recording. Two lesson plan formats, because they do different jobs.

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1Syllabus

Full-year course syllabus — grade level standard, the three content domains, all four CG quarters, all 52 competencies mapped across 33 weeks, DepEd grading weights, and a verification checklist. Names Quarter 4 as the pinch point of the grade — fourteen competencies in seven weeks, containing the first variable a learner ever meets — and says where to find the time.

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2aLesson Plan — ILAW

The whole week, in the format you file. Intentions · Learning Experiences · Assessment · Ways Forward — the template DO 009 s. 2026 prescribes for SY 2026–2027. Five days from the two-column ledger to checking a real advertised discount, with the multiplier withheld until Day 2 on purpose.

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2bLesson Plan — Lesson Exemplar

Day 1, at teaching depth. A 45-minute lesson timed to the minute. Seven anticipated misconceptions with scripted responses, full answer keys, three-tier differentiation, and a lesson that needs a board and nothing else.

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+Assessment Pack

A Table of Specifications for the term, three complete papers — Summative 1, Summative 2 and the 40-item Term Examination — with full answer keys and marking notes, a weekly written check, and rubrics for all four performance tasks. Every figure verified before shipping.

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3.3Offline Activities

Three individual options and two group options. No electricity, no devices, no budget — and no calculators, deliberately. The final group activity hands learners four real-shaped advertising claims and asks which are true, which are false, and which are true but misleading.

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+Class Record

Enter raw scores, get the grade. Written Works 20 · Performance Tasks 50 · Examinations 30, with the examination component split ST1/ST2/TE. Carries the SY 2026–2027 adjusted transmutation and the SY 2027–2028 zero-based rule as a switch. Runs in the browser, saves nothing, sends nothing.

For the class — four materials

What the learners see, use and hold.

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3.1Slide Presentation

15 slides timed to the lesson plan, built round the two-column ledger. Increase is one colour, decrease another, and the two peso amounts are always shown at the same size — because the whole lesson is that they are different. Prints as a one-slide-per-page handout.

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3.2Interactive Game

Percent of What? — three rounds: find a percentage, apply it, then reason. Every amount is held in centavos as a whole number, so no answer can drift by a rounding error. Wrong options model real errors — taking the second percentage of the original, adding two discounts — so the feedback names the mistake.

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+Learner Worksheet

The one artifact a learner actually holds. Printable A4, one page. Its ledger has a blank for the base on every line, so the sheet cannot be completed without stating what each percentage is a percentage of — and a learner who writes the original amount twice is visible at a glance.

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+Wall Chart

A printable A4 landscape reference — the worked ledger, the eight building blocks that make any percentage from 10% and 1%, a sixteen-entry multiplier table, and why 50% off then 20% off is 60% and not 70%. Also available as PDF and HTML.

Verified against the official CG

Standards and competencies here are quoted from the official MATATAG Mathematics Curriculum Guide (DepEd, August 2023) — Grade 7 sits on pages 23 and 52–55. Note that the Key Stage 3 grading attribution in the syllabus §6 is an inference from reporting, and is labelled as one.

How the week fits together Day 1 runs the lesson plan with the slides — or Individual Activity 1 if there is no projector. Day 2 introduces the multiplier, with Ten and One and the game's Round 1. Day 3 is The Price Tag Wall, with Round 2. Day 4 covers successive changes, with Round 3 and the Undo Hunt as enrichment. Day 5 is Checking the Flyer, then the weekly check.