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JSS1: MATHEMATICS - 1ST TERM

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  1. Whole Numbers I | Week 1
    3 Topics
    |
    1 Quiz
  2. Whole Numbers II | Week 2
    1 Topic
    |
    1 Quiz
  3. Counting in Base Two | Week 3
    4 Topics
    |
    1 Quiz
  4. Arithmetic Operations | Week 4
    3 Topics
    |
    1 Quiz
  5. Lowest Common Multiple (LCM) | Week 5
    2 Topics
    |
    1 Quiz
  6. Highest Common Factor | Week 6
    1 Topic
    |
    1 Quiz
  7. Fraction | Week 7
    7 Topics
    |
    1 Quiz
  8. Basic Operations with Fractions I | Week 8
    3 Topics
    |
    1 Quiz
  9. Basic Operations with Fractions II | Week 9
    1 Topic
    |
    1 Quiz
  10. Directed Numbers | Week 10
    3 Topics
    |
    1 Quiz
  11. Estimation and Approximation I | Week 11
    3 Topics
    |
    1 Quiz
  12. Estimation and Approximation II | Week 12
    6 Topics
    |
    1 Quiz



Lesson Progress
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Topic Content:

  • Approximation Involving the Four Basic Operations

Addition:

Worked Example 12.6.1:

What is the approximated answer to each of the following addition problems? 

i. 708   +   194
ii. 57.6   +   83.9

Solution

Round each number to 1 s.f or to the nearest 100. We have

i. 708   +  194     ≈     700   +   200    =    900

ii. 57.6   +   83.9   ≈      60   +   80   =    140

Subtraction:

Worked Example 12.6.2:

Round off each number to 1 s.f.

i. 3072 – 1365
ii. 595.845 –  96.869

 

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