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JSS1: MATHEMATICS - 1ST TERM

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  1. Whole Numbers I | Week 1
    3Topics
    |
    1 Quiz
  2. Whole Numbers II | Week 2
    1Topic
    |
    1 Quiz
  3. Counting in Base Two | Week 3
    4Topics
    |
    1 Quiz
  4. Arithmetic Operations | Week 4
    3Topics
    |
    1 Quiz
  5. Lowest Common Multiple (LCM) | Week 5
    1Topic
    |
    1 Quiz
  6. Highest Common Factor | Week 6
    1Topic
    |
    1 Quiz
  7. Fraction | Week 7
    7Topics
    |
    1 Quiz
  8. Basic Operations with Fractions I | Week 8
    3Topics
    |
    1 Quiz
  9. Basic Operations with Fractions II | Week 9
    1Topic
    |
    1 Quiz
  10. Directed Numbers | Week 10
    3Topics
    |
    1 Quiz
  11. Estimation and Approximation I | Week 11
    3Topics
    |
    1 Quiz
  12. Estimation and Approximation II | Week 12
    6Topics
    |
    1 Quiz
Lesson Progress
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Many of the numbers we use represent situations, which have direction as well as size. The numbers which have direction and size are called directed numbers.

 Once a direction is chosen as positive+, the opposite direction is taken as negative .

Screen Shot 2020 11 21 at 3.52.47 PM

Looking at the number line, you will observe that the numbers increase in value as you move from left to the right of the scale.

For example:

-5  is on the right of -6, so -5 is greater than -6. This means that -6 is less than -5.

Mathematically, the symbols ‘>’ and ‘<’ are used for greater than and less than respectively.

>  Means ‘is greater than’   i.e.  -5   >  -6

<  means “is less than” i.e. -6  <  -5.

Similarly on the number line.

-2 is on the right of -4, so -2  >  -4  or  -4  < –  2.

3 is on the right of -1. So 3  <  -1 or  -1  <   3.

8 is on the right of -7, so, 8  >  -7   or   -7  <   8.

Note:

On a number line, a number to the right is always greater than a number to the left

Example 1

Arrange these numbers in ascending order:

5,  -6,  -4,  -10,  -19,  7,  -13,  21  and 14

Solution

Ascending order means from smallest to largest.

-19, -13,  -10,  -6,  -4,  5, 7,  14.

Hint:

Note that the largest number with a negative sign is the smallest number and the largest number with a positive sign is the largest number.

Example 2

Arrange these numbers in descending order:  

-3,  1, -5, 10, 6, -7 and  3.

Solution

Descending order means from largest to smallest:

10,   6,   3,   1,   -3,   -5,   and   -7.

Example 3

Arrange these numbers in ascending order:

-8,   0,  -12,  7,  -5,  4,  20,  1.

Solution

-12,   -8,   -5,   0,  1,   4,   7,  20.

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