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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



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Topic Content:

  • Rounding Off Numbers

“Rounding off” means making a number simple but keeping its value close to what it was. The result may be less accurate, but easier to use.

There are many ways to round. This is the most common method:

1. Decide which is the last digit to keep.

2. Leave it the same if the next digit is less than 5 (this is called rounding down)

3. Increase it by 1 if the next digit is 5 or more (this is called rounding up).

Worked Example 11.2.1:

i. Round 2345 to the nearest 10

ii. Round 1734 to the nearest 100.

iii. Round to the nearest thousand
(a) 14 514
(b) 3 453 16

i. 2345 to nearest  ten

Solution

Screen Shot 2020 11 21 at 5.28.04 PM

5 unit is rounded up

The number in the tens increases by 1.

Hence 2  3  4 5  to nearest Ten is 2  3  5 0.

 

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