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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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The number 0.000 765 is given 6 decimal places. The zero before the decimal number means that there are no units and the three zeros after the decimal point mean that there are no tenths, no hundredths, and no thousandths, so the four zeros are not significant or the first significant figure.

Therefore, the most significant or first significant figure is 7. The second significant figure is 6 and the third significant figure is 5.

s.f e1606416848198

Note: the first significant figure is always the first non-zero figure as you read a number from the left.

Example:

Round off 246. 006 correct to:

i. 1 s.f
ii. 2 s.f
iii. 3 s.f
iv. 4 s.f
v. 5 s.f

Solution

i. 246 . 006 = 200 correct to 1  s.f.

ii. 246 . 006 = 250 correct to  2  s.f.

iii. 246 . 006 = 246 correct to 3  s.f.

iv. 246 . 006 = 246.0 correct to 4  s.f.

(Note that the zero after the decimal point in the answer is necessary to show four significant figures.

v. 246 . 006 = 246.01 correct to 5  s.f.

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