Here is your INCREASE & DECREASE - 5 Exam Questions + Memo - Grade 8 level. --- PRACTICE TEST - 20 MARKS Q1. (3 marks) A book costs R200. It increases by 10%. What is the new price? Show working. Q2. (3 marks) A school has 800 learners. The number decreases by 5%. How many learners are left? Q3. (4 marks) A phone costs R1000. First it increases by 20%, then it decreases by 20%. Is the final price R1000? Show calculation. Q4. (5 marks) In a shop: a) Shirt was R250, now R300. What is the percentage increase? (3) b) Is that increase more than 25%? (2) Q5. (5 marks) A Grade 8 class had 40 marks. Thandi got 32. a) If pass mark increases from 40% to 50%, will she still pass? (2) b) If her marks decrease by 10%, what will she get? (3) --- MEMO - ANSWERS Q1. 10% of 200 = 0.10 × 200 = 20. New = 200 + 20 = R220 ✅ Q2. 5% of 800 = 0.05 × 800 = 40. Left = 800 − 40 = 760 learners ✅ Q3. Increase: 1000 × 1.20 = R1200. Decrease: 1200 × 0.80 = R960. NO, not R1000 - it's less! This is a trick they love in exams. Q4. a) Increase = 300−250 = 50. % = (50 ÷ 250) × 100 = 20% increase b) No, 20% is less than 25%. Q5. a) 50% of 40 = 20. Thandi has 32, so YES she still passes, 32 > 20. b) 10% of 32 = 3.2. New = 32 − 3.2 = 28.8 ≈ 29 marks --- Exam formula to memorize: - % Increase = (New - Old) ÷ Old × 100 - % Decrease = (Old - New) ÷ Old × 100 You want next one on PROFIT and LOSS? That's also increase/decrease - they always ask it.