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Mathematics Form 3 Chapter 2 Standard Form Mathematics Form 3 Chapter 2 Standard Form
(c) 640 × 110 ÷ 1 800 PT3 Standard Practice 2 Section C (b) (i) Volume of cylinder = πr h
2
= 70 400 ÷ 1 800 = 22 × (0.07) × 0.5
2
= 7.04 × 10 ÷ (1.8 × 10 ) Section A 1. (a) k = 7, l = – 6 7
3
4
–3
= 3.91 × 10 4 – 3 1. 6.47 × 10 = 0.000647 ∴ k × l = 7 × (–6) = –42 = 7.7 × 10 m 3
–4
= 3.91 × 10 5.43 5.43 Mass
Answer: A (b) (i) = (ii) Density = Volume
29.56
(d) 2.63 × 10 × 3.2 × 10 –2 30.1 – 0.54 = 1.84 × 10 –1 –3 Mass
4
= 2.63 × 3.2 × 10 4 + (–2) 2. 3.43 × 10 –3 = 3.43 × 10 –3 0.9 kgm = 7.7 × 10 –3
–3
2
= 8.42 × 10 2 700 000 7 × 10 5 (ii) (6.09 × 10 ) ÷ (2.31 × 10 ) mass = (0.9 × 7.7 × 10 ) kg
–3
= 0.49 × 10 –3 – 5 = 6.09 ÷ 2.31 × 10 2 – (–3) –3
(e) 1.5 × 10 × 5.1 × 10 ÷ (4 × 10 ) = 4.9 × 10 –9 = 2.64 × 10 5 = 6.93 × 10 kg
2
–2
3
= (1.5 × 5.1 ÷ 4) × 10 –2 + 3 – 2 Answer: C 3 = 0.00693 kg
= 1.91 × 10 (c) (i) 2 356 = 2.36 × 10 m (c) Total price
–1
9
(ii) 1.05 × 10 = k × 10 = RM5.99(3.5) + RM9.90
11
3. 2k – 3s = RM30.865
2
11. (a) (i) k = 1.05 × 10 billion
= 2(6.14 × 10 ) – 3(1.09 × 10 ) = RM30.90
3
4
China Africa = 1.228 × 10 – 3.27 × 10 4
4
Cina Afrika = –2.042 × 10 4 2. (a) 9 000 seconds = 9 000 = 2.5 h
3 600 HOTS Challenge
Population 9 8 Answer: C Distance = Speed × Time
Jumlah Penduduk 1.32 × 10 8.32 × 10 = 75 kmh × 2.5
–1
4. Answer: D 3.45 × 10 –7
Land area (km ) 6 7 = 187.5 km = 3.45 × 10 × 10 9
2
–7
Luas tanah (km ) 9.60 × 10 2.66 × 10 = 187 500 m
2
5. A 3.0862 = 3.09 (3 s.f.) = 1.875 × 10 m = 3.45 × 10 2
5
B 3.0785 = 3.08 (3 s.f.) = 345 nanoseconds
(ii) Number of people per km in China
2
= 1.32 × 10 ÷ 9.60 × 10 6 C 3.0713 = 3.07 (3 s.f.)
9
= 0.1375 × 10 3 D 3.8045 = 3.80 (3 s.f.)
= 1.375 × 10 2 Answer: B
2
Number of people per km in Africa
= 8.32 × 10 ÷ 2.66 × 10 7 Section B
8
= 3.13 × 10
1. (a) Number of
significant
Number Answer
Nombor figures Jawapan
Bilangan
angka bererti
(i) 0.0183 2 0.018
(ii) 299 530 3 300 000
(iii) 43 4 43.00
(b) 0.000045 = 4.5 × 10 –5
+1

2. (a) 299 530  300 000
(b) 0.000000085 ÷ 1.7 × 10
–9
= 8.5 × 10 –8 ÷ 1.7 × 10 –9
= 8.5 ÷ 1.7 × 10 –8 + 9
= 50
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A5

BOOKLET ANS MATH F3.indd 5 03/01/2020 10:20 AM