Question

Find the missing denominator or numerator of 1/2 = /4

Answer 1

Simply cross-multiply about,

$\bf \cfrac{1}{2}=\cfrac{x}{4}\implies 4\cdot 1=2\cdot x\implies 4=2x\implies \cfrac{4}{2}=x\implies 2=x$

Answer 2

2/4 because is you multiply the numerator and denominator by 2/2 you will get 2/4