First multiply how many teachers there are by how many markers each teacher needs to find out how many markers are needed in all.
(When you see the word each, you will either multiply or divide. In this problem, you first want to know how many all together, so you will multiply.)
30 is the same as 3 x 10. So to make the problem simpler, multiply 379 x 3 and then add a zero at the end:
379 x 3 = 1,137
So 379 x 30 = 11,370 markers
Since each box holds 16 markers, divide the total amount of markers by how many markers come in a box:
11,370 ÷ 16 = 710 remainder 10
So if 710 boxes are ordered, there won’t be enough markers. So 711 boxes must be ordered.