JSS1: MATHEMATICS  1ST TERM

Whole Numbers I  Week 13 Topics1 Quiz

Whole Numbers II  Week 21 Topic1 Quiz

Counting in Base Two  Week 34 Topics1 Quiz

Arithmetic Operations  Week 43 Topics1 Quiz

Lowest Common Multiple (LCM)  Week 52 Topics1 Quiz

Highest Common Factor  Week 61 Topic1 Quiz

Fraction  Week 77 Topics1 Quiz

Basic Operations with Fractions I  Week 83 Topics1 Quiz

Basic Operations with Fractions II  Week 91 Topic1 Quiz

Directed Numbers  Week 103 Topics1 Quiz

Estimation and Approximation I  Week 113 Topics1 Quiz

Estimation and Approximation II  Week 126 Topics1 Quiz
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The Number Line
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 –.
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.
Responses