Let’s take some examples
Add 1/3 & 4/3
1/3 + 4/3
Since denominator is same,
we add numerators
= (1+ 4)/3
= 5/3
Subtract 6/9 from 2/9
2/9 − 6/9
Since denominator is same,
we add numerators
= (2 - 6)/9
= (-4)/9
Subtract 1/2 & 1/5
1/2 − 1/5
= (1 × 5 - 1 × 2)/(2 × 5)
= (5 - 2)/6
= 3/10
Add 1/2 & 1/3
1/2 + 1/3
= (1 × 3 + 1 × 2)/(2 × 3)
= (3 + 2)/6
= 5/6
Add 1/2 & (-1)/3
1/2 + ((-1)/3)
= 1/2 – 1/3
= (1 × 3 - 1 × 2)/(2 × 3)
= (3 - 2)/6
= 1/6
Add (-1)/2 & 1/3
(-1)/2 + 1/3
= (-1 × 3 + 1 × 2)/(2 × 3)
= (-3 + 2)/6
= (-1)/6
Add (-1)/2 & (-1)/3
(-1)/2 + ((-1)/3)
= (-1)/2 – 1/3
= (-1 × 3 - 1 × 2)/(2 × 3)
= (-3 - 2)/6
= (-(3 + 2))/6
= (-5)/6
