Question
Evaluate: $\frac{3}{4}-\frac{4}{5}$
✓
Answer
$\frac{3}{4}-\frac{4}{5}$
$LCM$ of $4$ and $5 = 20$
$\frac{3}{4}=\frac{3\times5}{4\times5}=\frac{15}{20}$
$\frac{4}{5}=\frac{4\times4}{5\times4}=\frac{16}{20}$
$\therefore\frac{3}{4}-\frac{4}{5}$
$=\frac{15}{20}-\frac{16}{20}$
$=\frac{15-16}{20}$$=\frac{-1}{20}$
$LCM$ of $4$ and $5 = 20$
$\frac{3}{4}=\frac{3\times5}{4\times5}=\frac{15}{20}$
$\frac{4}{5}=\frac{4\times4}{5\times4}=\frac{16}{20}$
$\therefore\frac{3}{4}-\frac{4}{5}$
$=\frac{15}{20}-\frac{16}{20}$
$=\frac{15-16}{20}$$=\frac{-1}{20}$
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
Out of 20000 voters in a constituency, 60% voted. Find the percentage of voters who did not vote. Can you find how many actually did not vote?
In fig. (i) $\text{PL}\bot\text{OA}$ and $\text{PM}\bot\text{OB}$ such that $\text{PL}=\text{PM}$. Is $\triangle\text{PLO}\cong\triangle\text{PMO}?$ Give reason in support of your answer. 
→What is the Error in question?
In the pattern $\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\dots$ which fraction makes the sum greater than $1$ (first time)? Explain.
→In the pattern $\frac{1}{3}+\frac{1}{4}+\frac{1}{5}+\dots$ which fraction makes the sum greater than $1$ (first time)? Explain.
The diameter of the driving wheel of a bus is 140 cm. How many revolutions per minute must the wheel make in order to keep a speed of 66 km per hour?
The selling price of $16$ spoons is equal to the cost price of $15$ spoons. Find the loss percent.
→Subtract: $\frac{-13}{9}\text{ from }0$
→The foot of a ladder is $6m$ away from its wall and its top reaches a window $8 m$ above the ground, If the ladder is shifted in such a way that its foot is $8m$ away from the wall, to what height does its top reach?
→ In Figure, write all pairs of adjacent angles and all the linear pairs.
A public sewer line is being installed along $80\frac{1}{4}\text{m}$ of road. The supervisor says that the labourers will be able to complete $7.5m$ in one day. How long will the project take to complete$?$
→Two sides of a triangle are $5\ cm$ and $9\ cm$ long. What can be the length of its third side$?$
→