On Sunday, Sheldon bought 4 1/2 kg of plant food. He used 1 2/3 kg on his strawberry plants and used 1/4 kg for his tomato plants. How many kilograms of plant food did Sheldon have left? Write one or more equations to show how you reached your answer.
4 1/2 - 1 2/3 - 1/4 , get rid of those useless mixed fractions
= 9/2 - 5/3 - 1/4 , your LCD is 12
= 54/12 - 20/12 - 3/12
= 31/12