Write these pairs of fractions as a pair with a common denominator

3/10 2/5. 1/3 3/4

10 * 5 * 4 = 200

60/200

400/200

50/200

you multiply all the denominator then

divide the result (200 here) by each denominator to get the nominator factor and nominator factor * nominator = new nominator

for ex

200 / 10 = 20

so 20 * 3/200 = 60 / 200 and so on