Question

evaluate: 1. 3/4 - 4/5​

Answer 1

Answer:

$\frac{3}{4} - \frac{4}{5}$

take out the lCM

we get, ⬇

$15 - 16 \div 20$

$\frac{ - 1}{20}$

Answer 2

LCM = 20 ( because to make the denominator same)

3/4 × 5/5 = 15/20 ( because 4 × 5 = 20)

4/5 × 4/4 = 16/20 ( because 5 × 4 = 20)

15/20-16/20 = 15-16/20 = -1/20