Question
Subtract:$\frac{21}{25}$ from $\frac{18}{20}$
✓
Answer
$\frac{18}{20}-\frac{21}{25}$ $LCM$ of $20$ and $25$ is $100$,
so we will convert each fraction into an equivalent fraction with denominator $100$.
$=\frac{18\times5}{20\times5}-\frac{21\times4}{25\times4}$
$=\frac{90}{100}-\frac{84}{100}$
$=\frac{90-84}{100}$
$=\frac{6}{100}$
$=\frac{3}{50}$
so we will convert each fraction into an equivalent fraction with denominator $100$.
$=\frac{18\times5}{20\times5}-\frac{21\times4}{25\times4}$
$=\frac{90}{100}-\frac{84}{100}$
$=\frac{90-84}{100}$
$=\frac{6}{100}$
$=\frac{3}{50}$
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
Find numbers between 330 and 340 that are divisible by 4 . Also, find numbers between 1730 and 1740 , and 2030 and 2040, that are divisible by 4 . What do you observe?
Simplify: $1\frac{5}{6}+\Big[2\frac{2}{3}-\Big\{3\frac{3}{4}\Big(3\frac{4}{5}\div9\frac{1}{2}\Big)\Big\}\Big]$
→Using tracing paper and centimeter graph paper to compare the areas of the following pairs of figure: 
If Floor A = -12, Floor D = -1 and Floor E = +1 in the building shown on the right as a line, find the numbers of Floors B, C, F, G and H.
What is the measure of the angle in degrees between:
(i) North and West?
(ii) North and South?
(iii) North and South-East?
(i) North and West?
(ii) North and South?
(iii) North and South-East?
Find the difference of:$\frac{13}{24}$ and $\frac{7}{16}$
→What is the perimeter of the figure? What do you infer from the answer?
Consider these statements:
(a) Only the last two digits matter when deciding if a given number is divisible by 4.
(b) If the number formed by the last two digits is divisible by 4, then the original number is divisible by 4.
(c) If the original number is divisible by 4, then the number formed by the last two digits is divisible by 4.
Do you agree? Why or why not?
(a) Only the last two digits matter when deciding if a given number is divisible by 4.
(b) If the number formed by the last two digits is divisible by 4, then the original number is divisible by 4.
(c) If the original number is divisible by 4, then the number formed by the last two digits is divisible by 4.
Do you agree? Why or why not?
Which number sequence is formed by counting the number of lines in each shape in the sequence of complete graphs?
Express as an improver fraction: $7\frac{3}4$
→