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Mathematics Form 3 Chapter 2 Standard Form

(d) 2.63 × 10 × 3.2 × 10 –2 (e) 1.5 × 10 × 5.1 × 10 ÷ (4 × 10 )
4
–2
3
2
= 2.63 × 3.2 × 10 4 + (–2) = (1.5 × 5.1 ÷ 4) × 10 –2 + 3 – 2
= 8.42 × 10 2 = 1.91 × 10 –1

11. Solve each of the following problems. PL 5 PL 6
Selesaikan setiap masalah yang berikut.

Example
Malaysia Singapore
Singapura
Population 32 million 4.48 million
Jumlah Penduduk 32 juta 4.48 juta
Land area (km ) 330 803 700
2
Luas tanah (km )
2
Based on the table above,
Berdasarkan jadual di atas,
(i) rewrite the population and land area of Malaysia and Singapore in standard forms,
tulis semula jumlah penduduk dan luas tanah Malaysia dan Singapura dalam bentuk piawai,
2
(ii) express the ratio of the number of people per km of Malaysia and Singapore in the form 1: n.
ungkapkan nisbah bilangan penduduk per km Malaysia dan Singapura, dalam bentuk 1 : n.
2
2
(i) Malaysia Singapore (ii) Number of people per km in Malaysia
7
Singapura = 3.2 × 10 ÷ 3.31 × 10 5
= 0.97 × 10 2
Population 3.2 × 10 7 4.48 × 10 6
Jumlah Penduduk = 9.7 × 10
2
Land area (km ) 3.31 × 10 5 7 × 10 2 Number of people per km in Singapore
2
Luas tanah (km ) = 4.48 × 10 ÷ 7 × 10 2
2
6
= 0.64 × 10 4
= 6.4 × 10 3
Ratio of number of people per km 2
(9.7 × 10 : 6.4 × 10 ) ÷ 9.7 × 10
3
Therefore, 1: n = 1: 66
(a) China Africa
Cina Afrika
Population 1.32 billion 832 million
Jumlah Penduduk 1.32 bilion 832 juta
Land area (km ) 9.60 million 26.6 million
2
Luas tanah (km ) 9.60 juta 26.6 juta
2
Based on the table above,
Berdasarkan jadual di atas,
(i) rewrite the population and land area of China and Africa in standard forms,
tulis semula jumlah penduduk dan luas tanah Cina dan Afrika dalam bentuk piawai,
(ii) find the number of people per km of China and Africa.
2
2
cari bilangan penduduk per km Cina dan Afrika.

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