Question

Mary has 12 marbles.3/12 of the marbles are yellow and 2/12 of the marbles are blue.The rest of the marbles are green.How many marbles are green?Explain how you know.

Answer 1

To get the answer we have to subtract from 12 marbles 3/12 of 12 and 2/12 of 12.
$\frac{3}{12}*12= 3$ - we can sipllify 12 here
$\frac{2}{12}*12=2$
12-3=9
9-2=7 - its the answer