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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Binary Subtraction
Note
0 â€“ 0 = 0
1 â€“ 0 = 1Â
1 – 1 = 0
10 â€“ 1 = 1Â
11 â€“ 1 = 10Â
Example:
SubtractÂ
a. 1011_{two }from 10101_{twoÂ }
b. 111010_{two} â€“ 11011_{twoÂ }
a. 1011_{two }from 10101_{twoÂ }
Note: First column by the right 1 1 = 0Â
Second column: 0 â€“ 1 is not possible, so we borrow 1 from the column to give 10. So, 10 â€“ 1 = 1Â
Third column: 0 â€“ 0 = 0Â
Fourth column: 0 1 is not possible, so borrow 1 from the next column to give 10. So, 10 â€“ 1 = 1Â
â‡’ 10101_{two }â€“ 1011_{two} = 1010_{two}Â
b. 111010_{two} â€“ 11011_{two}Â
First column by the right 0 1 is not possible so we borrow 1 from the second column to give 10. So, 10 â€“ 1 = 1Â
Second column: subtract 1 that was borrowed 1 â€“ 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 â€“ 1 = 1Â
Third column: 0 â€“ 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 â€“ 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 â€“ 1 = 1Â
Fifth column: subtract 1 that was borrowed 1 â€“ 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 â€“ 1 = 1Â
Sixth Column: subtract 1 that was borrowed 1 â€“ 1 = 0
â‡’ 111010_{two} â€“ 11011_{two} = 11111_{two}Â
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