Mr. Stewart's math class has 16 boys, and 22 of his students bring their calculators to class. If 13 of the students who brought calculators are girls, then how many boys didn't bring their calculators to class?
If there are 22 students who bought their calculators to class, and 13 of them are girls, then that means that 9 of them are boys. Since there are 16 boys in total, there are 16-9=7 boys who did not bring their calculators to class.
If there are 22 students who bought their calculators to class, and 13 of them are girls, then that means that 9 of them are boys. Since there are 16 boys in total, there are 16-9=7 boys who did not bring their calculators to class.
+81 
