1∕3=5km 18cm=? Let 18cm=xkm and cross multiply to solve for the value of x 13×x=5×18 Applying the principles of multiplying fractions Every number is being divided by 1 hence x=x∕1 13×x=5×18 Get rid of the fraction by multiplying both sides of the equation by the L.C.M of the denominators. The L.C.M of 3 and 1 is 3 , hence multiply both sides of the equation by 3 x=270
Alternatively You can cross multiply and solve for the value of x x×1=90×3 x=270 Alternatively, you can calculate how many times 1∕3 can go into 18 and multiply the result by 5 km Applying the principles of dividing fractions Thus when dividing fractions, you reverse the fraction at the right and change the division to multiplication Now you can use the principles of multiplying fractions to simplify Every number is being divided by 1