KS3 Year 9 / Mathematics / Curriculum
Number and proportion: structured theory, worked examples, answered practice, and a mastery checklist for KS3 Year 9.
CHAPTER PLAN
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Estimated active study time
209 minutes
Objectives, key ideas, and structured theory.
Open →Worked examples that explain every step.
Open →Graded tasks with hints and answer guidance.
Open →Assignments from core work to challenge.
Open →A timed, marked test with solution guidance.
Open →Progress is stored only in this browser and does not require AI credits.
Unit
The essential chapter ideas in a clear sequence before practice.
Write the number in a useful form, check sign and place value, and only then choose the operation. A clear representation reduces mechanical errors.
Fractions, decimals, percentages, ratios, and powers can describe the same quantity. Changing form is a solving tool, not a separate trick.
Estimate before and after the exact calculation. The sign, order of magnitude, and unit must agree with the problem context.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Use a suitable representation, state the rule, and keep every numerical or algebraic step equivalent. Finish with estimation, an inverse operation, or substitution as a check.
Mathematics
Follow the method step by step and check why every step is valid.
Calculate and simplify 2/6 + 3/6.
5/6
Before calculating, explain the key idea from “Standard form” and which conditions must be checked.
The answer should show not only which rule is used for “Standard form”, but also why it is valid here.
Number and proportion
Eight graded tasks from core fluency to exam-style application. Work independently before opening a hint or answer.
Calculate 8 + 2 × 10 and justify the order of operations.
Multiplication precedes addition.
8 + 2 · 10 = 28.
Find 4/16 of 64.
Multiply by the fraction and simplify first.
4/16 · 64 = 16.
Increase 420 by 35%.
Use multiplier 1 + 35/100.
420 · 1.35 = 567.0.
Divide 72 in the ratio 3:3.
There are 6 ratio parts.
72 : 6 = 12; 36 and 36.
Compare 6/11 and 5/30 using a common denominator or decimals.
Use cross-products.
6 · 30 = 180, 5 · 11 = 55; 6/11 > 5/30.
Write 1800000 in standard form.
The first factor must be at least 1 and less than 10.
1800000 = 1.8 × 10^6.
Estimate 490 ÷ 39.6, then calculate to one decimal place.
Round to compatible numbers before calculating exactly.
Estimate ≈ 500 ÷ 40 = 12.5. Exact ≈ 12.4.
Test the claim 8² + 6² = 14² and explain.
Calculate both sides separately.
64 + 36 = 100, while 14² = 196; false.
Number and proportion
Six distinct assignments from core fluency to challenge, each with an estimated time, hint, and answer guide.
Homework 1: Calculate 4 + 3 × 7 and justify the order of operations.
Multiplication precedes addition.
4 + 3 · 7 = 25.
Homework 2: Find 7/35 of 175.
Multiply by the fraction and simplify first.
7/35 · 175 = 35.
Homework 3: Increase 60 by 15%.
Use multiplier 1 + 15/100.
60 · 1.15 = 69.0.
Homework 4: Divide 120 in the ratio 6:4.
There are 10 ratio parts.
120 : 10 = 12; 72 and 48.
Homework 5: Compare 9/15 and 6/54 using a common denominator or decimals.
Use cross-products.
9 · 54 = 486, 6 · 15 = 90; 9/15 > 6/54.
Homework 6: Write 1500000 in standard form.
The first factor must be at least 1 and less than 10.
1500000 = 1.5 × 10^6.
50 minutes / 40 marks
A timed, full-mark self-assessment with model-answer guidance.
Start the timer when ready, work without notes, show every step, and open model answers only after finishing.
1. Calculate 9 + 3 × 12 and justify the order of operations.
2 marks9 + 3 · 12 = 45.
2. Find 5/25 of 125.
3 marks5/25 · 125 = 25.
3. Increase 160 by 40%.
3 marks160 · 1.40 = 224.0.
4. Divide 96 in the ratio 4:4.
4 marks96 : 8 = 12; 48 and 48.
5. Compare 7/13 and 6/42 using a common denominator or decimals.
4 marks7 · 42 = 294, 6 · 13 = 78; 7/13 > 6/42.
6. Write 900000 in standard form.
4 marks900000 = 0.9 × 10^6.
7. Estimate 588 ÷ 49.5, then calculate to one decimal place.
5 marksEstimate ≈ 600 ÷ 50 = 12.0. Exact ≈ 11.9.
8. Test the claim 9² + 2² = 11² and explain.
5 marks81 + 4 = 85, while 11² = 121; false.
9. Create and solve a two-step exam-style problem about “Inverse proportion” using 5, 4, and 20.
5 marksA valid response uses the data in two justified steps and includes an independent check; for example 5 × 4 = 20, then 20 + 9 = 29.
10. Write a revision rule for “Compound units”, one example, and one counterexample.
5 marksFull response: an accurate rule for “Compound units”, a numerical example that satisfies it, and an explained counterexample.
Unit
Curriculum reference sources. Always confirm the teaching sequence with the school and tutor.
Mathematics
Start from the board specification and work topic by topic before full papers.
The structure follows the official textbook layout and is used to organise study.
The areas that usually create mistakes or need extra revision.
Where to start: textbook, daily material, PDFs, videos, and worked examples.
Targeted practice before full tests so coverage is clear.
How to measure progress in this chapter and when it enters a cumulative mock.
What to do after finishing the chapter and how it connects to the next unit.
Note: for the official examinable syllabus of each school year, always confirm with the school, tutor, and current Ministry/IEP announcements.
