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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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Note 

0 – 0 = 0
1 – 0 = 1 
1 – 1 = 0
10 – 1 = 1 
11 – 1 = 10 

Example:

Subtract 

a. 1011two from 10101two 
b. 111010two – 11011two 

a. 1011two from 10101two 

ko e1605907168784

Note: First column by the right 1 -1 = 0 

Second column: 0 – 1 is not possible, so we borrow 1 from the column to give 10. So, 10 – 1 = 1 

Third column: 0 – 0 = 0 

Fourth column: 0 -1 is not possible, so borrow 1 from the next column to give 10. So, 10 – 1 = 1 

⇒ 10101two – 1011two = 1010two 

b. 111010two – 11011two 

li e1605907543407

First column by the right 0 -1 is not possible so we borrow 1 from the second column to give 10. So, 10 – 1 = 1 

Second column: subtract 1 that was borrowed 1 – 1 = 0. then what we have left is 0 – 1 which is not possible, so we borrow 1 from the third column to give 10. So, 10 – 1 = 1 

Third column: 0 – 1 = -1, -1 is less than 0 so we borrow 1 from the fourth column to give 10 – 1 = 1

Fourth column: subtract 1 that was borrowed 1 – 1 = 0. then what we have left is 0 – 1 which is not possible, so we borrow 1 from the fifth column to give 10. So, 10 – 1 = 1 

Fifth column: subtract 1 that was borrowed 1 – 1 = 0. then what we have left is 0 – 1 which is not possible, so we borrow 1 from the sixth column to give 10. So, 10 – 1 = 1 

Sixth Column: subtract 1 that was borrowed 1 – 1 = 0

⇒ 111010two – 11011two = 11111two 

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