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Mathematics Form 3 Chapter 2 Standard Form

(i) China Africa
Cina Afrika
Population 1.32 × 10 9 8.32 × 10 8
Jumlah Penduduk
Land area (km ) 9.60 × 10 6 2.66 × 10 7
2
Luas tanah (km )
2

(ii) Number of people per km in China
2
= 1.32 × 10 ÷ 9.60 × 10 6
9
= 0.1375 × 10 3
= 1.375 × 10 2
2
Number of people per km in Africa
8
= 8.32 × 10 ÷ 2.66 × 10 7
= 3.13 × 10

PT3 Standard Practice 2

Section A / Bahagian A 5. Which of the following numbers is rounded off to
3 significant figures to obtain 3.08? 2.1.2
1. Express 6.47 × 10 as single number. 2.2.1 Antara nombor-nombor yang berikut, nombor yang manakah
–4
Ungkapkan 6.47 × 10 sebagai nombor tunggal. dibundarkan kepada 3 angka bererti untuk memperoleh
–4
A 0.000647 C 6 470 3.08?
B 0.0000647 D 647 000 A 3.0862 C 3.0713
B 3.0785 D 3.8045
3.43 × 10 –3
2. = 2.2.2 Section B / Bahagian B
700 000
A 4.9 × 10 C 4.9 × 10 1. (a) Round off each number correct to the number
–3
–9
B 4.9 × 10 D 4.9 × 10 of significant figures stated. 2.1.2
–12
–6
Bundarkan setiap nombor betul kepada bilangan angka
bererti yang dinyatakan.
3. Find the value of 2k – 3s in standard form. Given
3
k = 6.14 × 10 and s = 1.09 × 10 . 2.2.2 [3 marks / 3 markah]
4
Cari nilai bagi 2k – 3s dalam bentuk piawai. Diberi Answer / Jawapan:
k = 6.14 × 10 dan s = 1.09 × 10 . Number of
4
3
A 2.042 × 10 C –2.042 × 10 4 significant
–4
B 2.042 × 10 D –2.042 × 10 –4 Number Answer
4
Nombor figures Jawapan
Bilangan angka
4. Which of the following numbers are written in bererti
standard form? 2.2.1
Antara yang berikut, nombor yang manakah diungkapkan (i) 0.0183 2 0.018
dalam bentuk piawai?
A 365 000 C 3.65 (ii) 299 530 3 300 000
B 36.5 × 10 D 3.65 × 10 (iii) 43 4 43.00
4
5
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