Serangoon Garden 4E5NA_E Maths_Prelim_P1_2021_MS

SGS/Mathematics/4E5N/2021/Prelims/4048/MS/P2 Serangoon Garden Secondary School 2021 Sec 4E/5NA Prelims P1 Suggested Mark Scheme Qn Solution Mark Scheme 1(a) B1 (b) 10.199 = 10.2 (3 s.f) B1 Total for Q1 2 m 2 US$5.40 = S$ US$5.40 = S$7.182 Cost of 1 litre of petrol in Los Angeles in terms of S$ = S$ = S$ = S$ 1.894 = S$1.89 ˂S$1.98 M1 Hence, petrol in Los Angeles is cheaper than Singapore. A1 Total for Q2 2 m 3(a) B1 B1 (b) Total for Q3 2 m 4 Amount of energy produced in 2020 = watts M1 watts = watts = watts (exact answer and should not be rounded off) A1 Total for Q4 2 m 5 ( is an isosceles triangle as OA = OP) M1 ( is bisected) Hence, . Since , OP is parallel to AB. A1 Total for Q5 2 m 6 Let the largest angle be .

2 SGS/Mathematics/4E5N/2021/Prelims/4048/MS/P1 M2 110.48º 110.5º A1 Total for Q6 3 m 7(a) 1: 50 000. 1 cm: 50 000 cm 1 cm: 0.5 km 12 cm: 6 km The actual distance between the two towns is 6 km. B1 (b) 1 cm: 0.5 km 1 cm2 : 0.25 km2 M1 72 cm2: 18 km2 The area of the theme park on the map is 72 cm2. A1 Total for Q7 3 m 8(a) m B1 (b) Distance the diver is below the sea level = Distance the diver is from the sea bed = B1 Total for Q8 2 m 9(a) B1 (b)(i) LCM = B1 (ii) is a perfect square as the power of each of its factor is even for all B1 values of . Total for Q9 3 m 10(a) M1 A1 (b) The minimum point is B1

3 SGS/Mathematics/4E5N/2021/Prelims/4048/MS/P1 (c) The graph will not cut the -axis as the minimum point is above the -axis. B1 Total for Q10 4 m 11(a) Initial amount of water = 9 litres B1 (b) Gradient = or M1 Equation is A1 Total for Q11 3 m 12(a) Let the original price of the washing machine be $ M1 The original price of the washing machine is $2600. A1 (b) Discount (%) = M1 = = 51% Hence, Jamie is incorrect as he is given only 51% discount and not 60% discount. A1 Total for Q12 4 m 13(a)(i ) = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11} = {integers : ˃ 5} = { ˃ 1}= {2, 3, 4, 5, 6, 7, 8, 9, 10, 11} B1 – Set B proper subset of set A B1 – Correct placement of