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Mathematics Form 3 Chapter 2 Standard Form

(b) Express 0.000045 in standard form. 2.2.1 Answer / Jawapan:
Ungkapkan 0.000045 dalam bentuk piawai. 5.43 5.43
[1 marks / 1 markah] (i) =
30.1 – 0.54 29.56
Answer / Jawapan: = 1.84 × 10 –1
–5
4.5 × 10
2
(ii) (6.09 × 10 ) ÷ (2.31 × 10 )
–3
= 6.09 ÷ 2.31 × 10 2 – (–3)
2. (a) Round off 299 530 correct to three significant = 2.64 × 10 5
figures. 2.1.2
Bundarkan 299 530 betul kepada tiga angka bererti.
[1 marks / 1 markah] (c) (i) A water fall has a width of 2 356 m, write
Answer / Jawapan: the width in standard form. 2.2.1
+1 Suatu air terjun mempunyai lebar 2 356 m, tulis
299 530  300 000 lebar itu dalam bentuk piawai.
[1 mark / 1 markah]

Answer / Jawapan:
3
(b) Fill in the blanks. 2.2.2 2 356 = 2.36 × 10 m
Isi tempat kosong.
[3 marks / 3 markah]
Answer / Jawapan: (ii) It is estimated that by the year 2060, the
world population will exceed k billion. If
–9
0.000000085 ÷ 1.7 × 10 the world population in the year 2060 is
11
1.05 × 10 , find the value of k. 2.2.3
= 8.5 × 10 –8 ÷ 1.7 × 10 –9 Jumlah bilangan penduduk dunia dijangka akan
mencapai k billion pada tahun 2060. Jika jumlah
= 8.5 ÷ 1.7 × 10 –8 + 9 penduduk dunia pada tahun 2060 ialah 1.05 ×
10 , cari nilai k.
11
= 50 [2 marks / 2 markah]
Answer / Jawapan:
1.05 × 10 = k × 10
9
11
Section C/ Bahagian C k = 1.05 × 10 billion
2
k
1. (a) Given 69 350 000 = 6.935 × 10 and 0.00000123 –1
l
= 1.3 × 10 , find the value of k × l. 2.2.2 2. (a) The speed of a car is 75 kmh . At this speed,
Diberi 69 350 000 = 6.935 × 10 dan 0.00000123 = 1.3 × 10, find the distance, in m, travelled by the car in 9
k
l
cari nilai bagi k × l. 000 seconds. Express your answer in standard
[3 marks / 3 markah] form. 2.2.3
Kelajuan sebuah kereta ialah 75 kmh . Pada kelajuan
–1
Answer / Jawapan: ini, cari jarak, dalam m, yang dilalui oleh kereta itu
k = 7, l = –6 dalam masa 9 000 saat. Nyatakan jawapan anda dalam
bentuk piawai.
∴ k × l = 7 × (–6) = –42
[3 marks / 3 markah]
Answer / Jawapan:
9 000
(b) Evaluate and give your answers in standard 9 000 seconds = 3 600 = 2.5 h
form. 2.2.2
Nilaikan dan beri jawapan anda dalam bentuk piawai. Distance = Speed × Time
–1
= 75 kmh × 2.5
5.43
(i) [2 marks / 2 markah] = 187.5 km
30.1 – 0.54
= 187 500 m
(ii) (6.09 × 10 ) ÷ (2.31 × 10 ) = 1.875 × 10 m
2
–3
5
[2 marks / 2 markah]
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02 TOP MATH F3.indd 14 03/01/2020 8:00 AM