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JSS1: MATHEMATICS - 1ST TERM
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Whole Numbers I | Week 13 Topics|1 Quiz
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Whole Numbers II | Week 21 Topic|1 Quiz
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Counting in Base Two | Week 34 Topics|1 Quiz
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Arithmetic Operations | Week 43 Topics|1 Quiz
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Lowest Common Multiple (LCM) | Week 52 Topics|1 Quiz
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Highest Common Factor | Week 61 Topic|1 Quiz
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Fraction | Week 77 Topics|1 Quiz
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Basic Operations with Fractions I | Week 83 Topics|1 Quiz
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Basic Operations with Fractions II | Week 91 Topic|1 Quiz
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Directed Numbers | Week 103 Topics|1 Quiz
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Estimation and Approximation I | Week 113 Topics|1 Quiz
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Estimation and Approximation II | Week 126 Topics|1 Quiz
Lesson 12,
Topic 5
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Approximation
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Topic Content:
- Approximation
Approximation means rounding off. We round off numbers to simplify them so they will be easy to use and easy to remember.
Example: Ehime bought a pair of shoes for ₦90. If someone asks him the price of the shoes, he may say the price is ₦100.
- This is called rounding up where the new number is bigger and the given number.
- ₦90 ≈ ₦100 (means ₦90 is approximately equal to ₦100).
Example: A dress costs ₦81. You are more likely to say that the cost of the dress was ₦80.
- This is called rounding down where the new number is smaller than the given number.
- ₦81 ≈ ₦80 (This means ₦81 is approximately equal to ₦80).