Year 8 Term 1 Assessment Mark Scheme

a) 24:36 = 2:3 (2)

b) Sugar = 250 × (2/3) = 166.7 g (2)

c) 8 cm × 50,000 = 400,000 cm = 4 km (4)

a) 3/4 + 5/6 = 9/12 + 10/12 = 19/12 or 1 7/12(2)

b) 7/8 − 3/10 = 70/80 − 24/80 = 46/80 = 23/40 (2)

c) 4/5×3/7 = 12/35 (2)

d) 5/6÷2/9 = 5/6×9/2=45/12=15/4 =3 3/4 (2)

a) 15% of 240 = 36 (2)

b) £60 – 20% = £60 – £12 = £48 (2)

c) Increase = 60, ÷ 480 = 0.125 = 12.5% (2)

d) 170 ÷ 0.85 = £200 (2)

a) Table of values correct (2)

plotted straight line (1). (3)

b) Gradient = (7–3)/(3–1) = 2 (2)

equation found: y=2x+1 (3). (5)

a) Frequency table (correct grouping and totals) (3).

b) Scatter graph: points plotted correctly (3)

correlation described as positive (2).

a) P(Red) = 3/12 = 1/4 (1)

P(Blue) = 4/12 = 1/3 (1)

P(Not Green) = 7/12 (2)

b) Sample space (16 outcomes listed) (2)

P(at least one A) = 1 – P(no A) = 1 – (3/4 × 3/4) = 1 – 9/16 = 7/16 (2).

Rubric (linked to GCSE Levels 1–9)

Level 1–3 (0–16 marks) – Needs More Work
- You can attempt simple ratio, fractions, and probability, but multi-step problems are difficult.
- Next steps: Practise fraction arithmetic, simple ratio, and plotting points. Use BBC Bitesize and Khan Academy basics.
Level 4–6 (17–32 marks) – Good but revise areas shown
- You are confident with most topics but may struggle with harder skills like reverse percentages, equations of lines, and interpreting scatter graphs.
- Next steps: Review journal entries and redo worksheets for weak areas.
Level 7–9 (33–48 marks) – Excellent
- You demonstrate strong understanding across the full range.
- Next steps: Try extension GCSE questions on simultaneous equations with graphs and probability trees.