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JSS2: MATHEMATICS - 1ST TERM
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Properties of Whole Numbers I | Week 14 Topics|1 Quiz
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Properties of Whole Numbers II | Week 24 Topics|1 Quiz
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Properties of Whole Numbers III | Week 35 Topics|1 Quiz
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Indices | Week 42 Topics|1 Quiz
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Laws of Indices | Week 55 Topics|1 Quiz
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Whole Numbers & Decimal Numbers | Week 64 Topics|1 Quiz
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Standard Form | Week 73 Topics|1 Quiz
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Significant Figures (S.F) | Week 84 Topics|1 Quiz
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Fractions, Ratios, Proportions & Percentages I | Week 96 Topics|1 Quiz
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Fractions, Ratios, Proportions & Percentages II | Week 104 Topics|1 Quiz
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Fractions, Ratios, Proportions & Percentages III | Week 113 Topics|1 Quiz
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Approximation & Estimation | Week 121 Topic|1 Quiz
Lesson 8,
Topic 3
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Whole Numbers & Quantities
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Topic Content:
- Round Off Whole Numbers & Quantities
To round off a number or quantity to the nearest whole number or to the nearest of that quantity, compare the last digit before the decimal point and the first digit after the decimal point.
Worked Example 8.3.1:
Round off the following to the nearest whole number:
a. 6.2009
b. 524.89
c. 0.952
Solution
a. 6.2009
= 6 to the nearest whole number
b. 524.89
= 525 to the nearest whole number
c. 0.952
= 1 to the nearest whole number
Worked Example 8.3.2:
Round off each of the following;
a. 42.90 cm to the nearest cm = 43 cm
b. 7.3 m to the nearest m = 7 m
c. 3975 km to the nearest 10 km = 3975 km = 3980 km
d. 6506 g to the nearest 100 g = 6506 g = 6500 g