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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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It is possible to add, subtract and multiply binary numbers in a similar way to base ten numbers. The main things to remember in base two are the following

Addition: To add in base two note that 

0 + 0 = 0
0 + 1 = 1
1 + 0 = 1 
1 + 1 = 10 

Example 1

Add 111two to 11two 

ll e1605906053954

⇒ 111two + 11two = 1010two

Hint 

First column by the right: 1 + 1 = 10 

Write the 0 and carry 1 forward (1) 

Second column in the middle: (1) carried +1 +1 = 11. 

Write down 1 and carry 1 forward (1) 

Third column: 1 carried + 1 = 10 

Example 2

Add 1011two to 1101two 

Solution 

LK e1605906398838

First column by the right: 1 + 1 = 10 write down 0 and carry 1

Second column: the 1 carried forward +1 write down 0 carry 1

Third column: the 1 carried forward from second column +1, write down 0 and carry 1  

Fourth column: 1 carried from third column + 1 + 1 = 11 

⇒ 1011two + 1101two = 11000two

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