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JSS3: MATHEMATICS - 1ST TERM

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  1. Binary Number System I | Week 1
    5Topics
    |
    1 Quiz
  2. Binary Number System II | Week 2
    6Topics
    |
    1 Quiz
  3. Word Problems I | Week 3
    4Topics
    |
    1 Quiz
  4. Word Problems with Fractions II | Week 4
    1Topic
    |
    1 Quiz
  5. Factorisation I | Week 5
    4Topics
    |
    1 Quiz
  6. Factorisation II | Week 6
    3Topics
    |
    1 Quiz
  7. Factorisation III | Week 7
    3Topics
    |
    1 Quiz
  8. Substitution & Change of Subject of Formulae | Week 8
    2Topics
    |
    1 Quiz
  9. Simple Equations Involving Fractions | Week 9
    3Topics
    |
    1 Quiz
  10. Word Problems | Week 10
    1Topic
    |
    1 Quiz
Lesson Progress
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The most widely used number base system after base 10 is the binary system because of its application to computers. In a binary system, the greatest digit used is 1, so the two digits available in the binary system are 0 and 1.

Binary system is called Base Two.

Binary Arithmetic

Example

Convert the following denary numbers into binary number

a. 15

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= 1111two

b. 48

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110000two

c. 29

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= 11101two

d. 69

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= 1000101two

Converting binary numbers to base 10

i. 10011two = 1 x 24 + 0 x 23 + 0 x 22 + 1 x 21 + 1 x 20

16 + 0 + 0 + 2 + 1 =  19ten

ii. 100111two =   1 x 25 + 0 x 24 + 0 x 23 + 1 x 22 + 21 x 1 + 1 x 20

= 32 + 0 + 0 + 4 + 2+ 1  =  39ten

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