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Mathematics Form 3 Chapter 2 Standard Form

4. Round off each of the following decimals to the specified significant figures. PL 2
Bundarkan setiap nombor perpuluhan yang berikut kepada angka bererti yang dikehendaki.

Example
(a) 0.491 (b) 0.07028
0.0891 [2 s.f. / a.b.] [3 s.f. / a.b.]
[2 s.f. / a.b.]
0.089 0.49 0.0703
(c) 0.21976 (d) 0.458 (e) 0.0299
[4 s.f. / a.b.] [2 s.f. / a.b.] [1 s.f. / a.b.]
0.2198 0.46 0.03

5. Calculate each of the following and round off your answer to the specified number of significant figures. PL 3
Hitung setiap yang berikut dan bundarkan jawapan anda mengikut bilangan angka bererti yang dikehendaki.

Example
(a) 5.23 × 1 025 ÷ 50
2.12 × 323 + 60 – 13.2 × 10 [1 s.f. / a.b.]
[2 s.f. / a.b.]
3
= 684.76 + 60 – 132 = 5.36075 × 10 ÷ 50
= 744.76 – 132 = 107.215
= 612.76 = 100
= 610

(b) 42.5 × 8.12 ÷ 400 (c) 980 – 6.13 ÷ 0.02
[3 s.f. / a.b.] [2 s.f. / a.b.]

= 345.1 ÷ 400 = 980 – 306.5
= 0.86275 = 673.5
= 0.863 = 670

55.6 – 34.5 (e) (31.2 + 0.9) × (4.5 – 0.87)
(d)
109 + 58 [1 s.f. / a.b.] [3 s.f. / a.b.]
= 21.1 = 32.1 × 3.63
167 = 116.523
= 0.12635 = 117
= 0.1

2.2 Standard Form
Bentuk Piawai

NOTES
6. State each of the following number in standard form. PL 1 PL 2
Nyatakan setiap nombor yang berikut dalam bentuk piawai.
Example
(a) 545 = (b) 651 00 =
3 540 =
5.45 × 10 2 6.51 × 10 4
3.54 × 10 3
(c) 26 = (d) 4 300 000 = (e) 1 037 =

2.6 × 10 4.3 × 10 6 1.037 × 10 3

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