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ppr maths nbk
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CHAPTER 1 : STANDARD FORM
EXERCISE 2
1. Round off each of the following numbers to 3 significant figures.
(a) 2963 = __________________ (b) 51852 = __________________
2. Round off 71.65 to
(a) 3 Significant figures = __________________ (b) 1 Significant figures = __________________
3. Round off 0.06053 to
(a) 3 Significant figures = __________________ (b) 2 Significant figures = __________________ (c) 1 Significant figures = __________________
4. Express each of the following numbers in standard form
(a) 48000 = ___________________ (b) 9200.05 = ___________________ (c) 0.026 = ___________________ (d) 0.00000038 = ___________________
5. Convert the following numbers in standard form to a single number.
(a) 31019.2 × = ___________________ (b) 4102.8 −× = ___________________
6. Evaluate each of the following and express your answers in standard form.
(a) 16000000 + 2500000 = ____________________ (b) 0.69 + 10.451 = ____________________
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7. Evaluate each of the following and express your answers in standard form.
(a) 920000 – 87000 = ____________________ (b) 0.043 – 0.00095 = ____________________
8. Evaluate each of the following and express your answers in standard form.
(a) 7008.4 × = ____________________ (b) 065.00029.0 × = ____________________
9. Evaluate each of the following and express your answers in standard form.
(a) 03.06.48 × = ____________________ (b) 04.0000096.0 ÷ = ____________________
10. Given that the mass of a carbon atom and an oxygen atom are 23102 −× g and
23107.2 −× g respectively, one molecule of carbon dioxide gas consist of one carbon atom and two oxygen atoms. Calculate the mass in gram, of one molecule of carbon dioxide gas.
Answer : _________________
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CHAPTER 1 : STANDARD FORM
DIAGNOSTIC TEST 1. Round off 0.0487 correct to two significant figures.
A 0.04 B 0.05 C 0.048 D 0.049
2. =+× 77000107.2 5 A 1.04 × 105 B 1.04 × 109 C 3.47 × 105
D 3.47 × 109
3. The area of a rectangular plot of land is 9.2 km2. Its width is 2300 m. Find the length, in m, of the plot of land.
A 4 × 103
B 4 × 104 C 6.9 × 103 D 6.9 × 104
4. Express 0.0000405 in standard form.
A 4.05 × 10-5 B 4.05 × 105
C 405 × 10-7
D 405 × 107
5. ( )
=×
×⋅−
−
23
2
10410289
A 310322 ×⋅ B 410322 ×⋅ C 31085 ×⋅ D 41085 ×⋅
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6. =×⋅−×⋅ −− 87 107310345
A 810641 −×⋅ B 710641 −×⋅ C 810974 −×⋅ D 710974 −×⋅
7. Round off 072070 ⋅ correct to three significant figures. A 070 ⋅ B 0720 ⋅ C 07200 ⋅ D 07210 ⋅ 8. Round off 80725 correct to three significant figures. A 80700 B 80720 C 80730 D 80800 9. Express 61092639 −×⋅ as a single number.
A 0092630 ⋅ B 00092630 ⋅ C 000092630 ⋅ D 0000092630 ⋅
10. =⋅
4000000020
A 3105× B 4105× C 8105 −× D 9105 −×
