← GCSE Mathematics

N11-N12 Fractions of amounts, percentages as operators

Currently Secure · last touched 2026-10-20

Read the answer line back on money questions (14 Oct: gave the increase for the new price); pound sign on the answer; a multiplier used on an amount, not only recalled, still to see. 16 Oct: new price right with the read-back step named.

Every change

WhenChangeEvidenceSession
2026-10-20Developing → Secureadjudicated paper #9 Q4: 1/2, why:bar, loss=technique (15% of 60 found as 10%+5%, answered the increase not the new price) — knowledge shown, so at the bar; trail holds unaided successes on 9, 10 and 13 Oct (multipliers cold; £60 less 15% with working), developing → secure, the paper as the confirming occasion.standalone
2026-10-16Developing → Developing16 Oct, non-calc, typed, 'read the last line back first': coat 60 pounds up 15 percent, new price: 60/10 = 6, 6/2 = 3, 60 + 6 + 3 = 69. New price given, not the increase (the 14 Oct error), working on every line, no pound sign, 2 min, 1/1.session 111
2026-10-14Developing → Developingpaper #9 Q4: 1/2, loss=technique — 10% and 5% of 60 found (M1), answered 9 (the increase) where the new price was asked; no multiplier; 4 min on a 2-min guidesession 104
2026-10-13Developing → Developing13 Oct mixed set, non-calc, unaided, worded show your working: 60 pounds reduced by 15 percent. Typed 60/10 = 6, 6/2 = 3, 3 + 6 = 9, 60 - 9 = 51, with an answer sentence and the pound sign. Right, 5 min, 1/1. Built from 10 percent and 5 percent, no multiplier used; one line ran 3 + 6 = 9 = 15 for 9 is 15 percent. Third separate day right (9 and 10 Oct multipliers). Proposed secure stands, for adjudication.session 99
2026-10-10Developing → Developing10 Oct, cold, non-calc, no notes: multiplier for a 15 percent increase -> '1.15'; for a 30 percent decrease -> '0.7'. 2/2 right first time, second separate day (9 Oct: 1.12 and 0.8). Meets the return condition recorded on 9 Oct; proposed secure, for adjudication. Multipliers recalled only: not used on an amount today. Retrieval outcome: correct.standalone
2026-10-09Developing → Developing9 Oct, cold, non-calc, no notes: multiplier for a 12 percent increase -> 1.12 (2 min); for a 20 percent decrease -> 0.8 (3 min); both right first time, the first of the two separate days needed. Mixed set, non-calc: 80 pounds reduced by 15 percent -> 68, right first time in 3 min, typed bare: no pound sign, no working typed, paper not seen. Session 90. Retrieval outcome: correct.standalone
2026-10-08Secure → DevelopingDemotion: second miss in two days. 8 Oct, cold and untimed, non-calc: asked for the single multiplier for a 7.5 percent increase, answered 8. After 100 x 8 was shown to be too big she gave 107.5 percent of the original, then 1.075 as a decimal: right after 2 prompts. 7 Oct timed paper: wrote 240*7.5 percent for the same idea, 0/1. Fractions and percentages of amounts not asked today.session 88
2026-10-07Secure → SecureExam practice 7 Oct (test #7, attempt #15, timed) Q2: 'circle the calculation that increases 240 by 7.5%' answered with her own expression '240*7.5%' rather than one of the four options; 0/1. Marking only: no status change, for adjudication. Retrieval outcome: incorrect.standalone

In papers

AttemptPaperQMarksNote
Exam practice — week 42 · maths, lit, cs — GCSE Mathematics sectionexam-skills #941/2M1 6 and 3 seen (10% and 5%); A0 answer 9 = the increase only, not the new price. 4 min on a 2-min question. loss=technique (command 'new price' not read back; N11-N12 flagged in maths next_steps already).
Exam practice — week 41 — GCSE Mathematics sectionexam-skills #720/1B0: typed '240*7.5%' — not one of the four printed options. Equivalent to 240 × 0.075, which is the increase alone, not the increased amount. 240 × 1.075 required.