$\frac{3}{8}$ of a colored silk strip was taken from $\frac{4}{5}$ of the given strip to decorate. How many stamps did he give to Tuan ?

( Write the result as a/b )

Find the value of x such that:

X + $\frac{2}{3}$ = $\frac{9}{8}$ - $\frac{2}{5}$  $$

( Write the result as a/b )

Son used $\frac{9}{2}$ m of  rope to pitch a tent. Ha used $\frac{3}{10}$ m less than Son to pitch another tent. How many meters of rope did they use altogether ?

Calculate the sum:

$\frac{1}{2}+\frac{1}{6}+\frac{1}{12}+\frac{1}{20}+\frac{1}{30}$ = ?

Compare:

$\frac{1995}{1996}$ và $\frac{1996}{1997}$

Find a fraction knowing that move 5 units in the denominator up the numerator we get a new fraction equals 1, if move 9 units in the numerator down the denominator we get a new fraction equals $\frac{3}{5}$  ?

Find a fraction knowing that move 5 units in the denominator up the numerator we get a new fraction equals 1, if move 5 units in the numerator down the denominator we get a new fraction equals $\frac{4}{5}$ ?

Find a fraction. Knowing that move 8 units in the denominator up the numerator we get a fraction equals 1. If move 5 units in the denominator up the numerator we have a fraction is $\frac{4}{5}$ ?

Find a fraction knowing that fraction equals $\frac{2}{5}$  and the numerator increased by 45 units, we get a new fraction equals $\frac{13}{20}$ ?

The fraction equals $\frac{5}{8}$ . If the numerator increased by 6 units, we get a new fraction equal $\frac{2}{3}$ . Find that fraction ?

Find a fraction knowing that the numerator increased by 10 units we have a new fraction $\frac{5}{4}$ , If  the numerator decreased by 8 unit to get the fraction $\frac{4}{5}$ ?

The fraction $\frac{17}{25}$ . How many units did we decreased in the numerator and the denominator to get new fraction, simplifying new fraction we have fraction $\frac{2}{3}$ ?

Find the fraction $\frac{a}{b}$  with a + b = 96. If simplifying fraction $\frac{a}{b}$ we have the fraction $\frac{1}{3}$ . Find the fraction $\frac{a}{b}$ ?

The fraction $\frac{a}{b}$ with a + b = 200, If simplifying $\frac{a}{b}$ we have fraction $\frac{3}{5}$ . Find the fraction $\frac{a}{b}$?

The fraction $\frac{54}{63}$. Find the natural number a so that the numerator decreased by a and the denominator increased by a of the fraction we have a new fracion with value is $\frac{4}{5}$?