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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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In a horizontal number line:

1. When adding, start from the first number, count right along the number line.

2. When subtracting, start from the first number, count left alone the number line.

Note:

In a horizontal number line, numbers to the right of zero are positive, and numbers to the left are negative.

Example 4

Use number line to find the value of:

i. 0 +  6

ii. 2 + 7

iii. -6  –  4

iv. -8  +  11

v. -5   +  4

vi. -3  –  5

Solution

i. 0   +   6

 *Start at 0, count 6 places to the right to end up at 6.

Screen Shot 2020 11 21 at 4.00.09 PM

So,   0  +  6   =  6

ii. 2   +   7  

 *Start at 2, count 7 places to the right to end up at 9.

Screen Shot 2020 11 21 at 4.05.54 PM

 So,  2  +  7  =  9.

 iii. -6  –  4

*Start at -6, count 4 places to the left to end up at -10.

Screen Shot 2020 11 21 at 4.11.28 PM

So, -6  -4     =   -10.

iv. -8   +  11

*Start at -8, count 11 places to the right to end up at 3.

Screen Shot 2020 11 21 at 4.18.51 PM

v. -5    +     4

*Start at -5, count 4 places to the right to end up at -1.

Screen Shot 2020 11 21 at 4.21.32 PM

vi.  -3  –  5

*Start at -3, count -5 places to the left to end up at -8.

Screen Shot 2020 11 21 at 4.23.43 PM

So,   -3   – 5   =   -8

Note: 

The -ve sign directs the number to the left while the +ve directs the number to the right.

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