This document explains how to solve division problems using grouping. It shows that 12 divided by 3 equals 4 because there are 4 groups of 3 in 12. Similarly, it demonstrates that 15 divided by 5 is 3 because there are 3 groups of 5 in 15. Finally, it presents 16 divided by 4 as 4 because there are 4 steps of 4 to reach 16 when counting up in increments of the divisor.