3.OA.A.2
Interpret whole-number quotients of whole numbers, e.g., interpret 56 ÷ 8 as the number of objects in each share when 56 objects are partitioned equally into 8 shares, or as a number of shares when 56 objects are partitioned into equal shares of 8 objects each. For example, describe a context in which a number of shares or a number of groups can be expressed as 56 ÷ 8.
Divide by separating into equal groups. This includes separating counters into equal groups, which can be done using paper plates and counters. It can also be taught using Unifix cubes, as seen here. After learning some concrete method, proceed to using arrays of dots. For example, to find 12 / 4:
****
****
****