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Exam practice — week 45 · maths, lang, cs — GCSE Mathematics section

2026-11-04 · check · 1 paper · 9/17 · 53% · not grade-converted

Exam Skills test #12, typed on the portal, sat 34 min for the whole paper.

exam-skills #12 9/17

sat 2026-11-04 · 0 left blank

QTopicMarksQuestionAnswer givenNote
1N1-N30/1Circle the value of 5 + 2 × 4^2 21 37 69 112 [1 mark]21 Working: 4*4 = 8,8*2 = 16,5+16 = 21B0: 21 circled, one answer. Order of operations correct (power, ×, +) but 4^2 written as 4*4 then evaluated as 8 — squaring as doubling, the same error as 3² = 6 on 14 Oct. 4^2 = 16 was NOT written. 1 min on 1-min guide.
2N140/2Estimate the value of (6.12 × 28.7) ÷ 0.52 You must show your working. [2 marks] Answer ______174 Working: (6*29)/1 = 174, 6*29 = 174M0 A0: rounded values written before multiplying, but only 6 is a 1 s.f. rounding — 28.7→29 and 0.52→1 (not 30 and 0.5). Scheme needs two of 6, 30, 0.5 seen; only one. Answer 174 not ft-able. Method (round first, then work) was there; the 1 s.f. rule was not. 2 min on 2-min guide.
3A173/3Solve 3(2x − 5) = 4x + 7 You must show your working. [3 marks] x = ______x = 11 Working: 6x-15=4x+7,6x=4x+22, 2x=22M1 6x−15=4x+7; M1 2x=22; A1 x=11. Every line valid, collection shown as 6x=4x+22 then 2x=22. No check line (not required). 2 min on 3-min guide. First time A17 seen inside a timed section — clean.
4P80/3A bag contains 5 red counters and 3 blue counters. Two counters are taken at random, without replacement. Work out the probability that the two counters are different colours. [3 marks] Answer ______the probability that the two counters are different coulers is 15/49 Working: 7*7=49,5*3=15M0 M0 A0: 7*7=49 and 5*3=15 → 15/49. Denominators 7 and 7 (neither 8 then 7 nor 8 and 8); only one order of colours counted; no tree or branch written. No creditable branch. 3 min on 3-min guide.
5A220/2Solve 15 − 4x > 3 [2 marks] Answer ______x<-4.5 Working: -4x>18,x<-4.5M0 A0: −4x>18 (3−15 taken as +18) then x<−4.5. The x term was isolated but the constant is wrong, so the M1 line is not oe. Divide line written and the flip was on that line, done correctly — this is the flip-under-time A22 was waiting to see, and it was right; the loss is a negatives slip (N1-N3). 3 min on 2-min guide.
6G14-G162/2A rectangle measures 9 cm by 6 cm. A square of side 2 cm is cut from one corner of the rectangle. Work out the area of the shape that is left. [2 marks] Answer ______ cm^250cm2 Working: 9*6=54, 54-4=50M1 A1: 9*6=54, 54−4=50. Working lines written though not demanded; unit written '50cm2' on the answer. 1 min on 2-min guide.
7A1-A32/2a = −4 and b = 5 Work out the value of 3a^2 − 2b [2 marks] Answer ______38 Working: -4*-4=16,16*3=48,5*2=10, 48-10=38M1 A1: −4*−4=16, 16*3=48, 5*2=10, 48−10=38. Sign on (−4)² handled. Page measured 6 min on a 2-min guide but she had moved around the paper so treat as a guide; full marks either way.
8N152/2A number n is rounded to the nearest 10 The result is 340 Write down the error interval for n. [2 marks] Answer ______335 <= n < 345B2 335 ⩽ n < 345. Both bounds, both signs, question's letter used first time (N15 loose end). 1 min on 2-min guide.

Marks by topic

Ordered by marks lost. These are the candidates for reteaching.

TopicNameMarksLost
P8Combined events: add versus multiply0/33
A22Inequalities0/22
N14Estimation and rounding0/22
N1-N3Place value, four operations, negatives, order of operations0/11
A1-A3Notation, substitution, vocabulary2/20
A17Solving linear equations3/30
G14-G16Perimeter and area2/20
N15Error intervals and bounds2/20