Three types of math word problems using bar models to solve for unknowns in multiplication and division.
A diagram illustrating three types of multiplication and division word problems using bar models: "Whole unknown" (4 children each pay £15, total cost?), "Size of groups unknown" (4 children pay £60 total, cost per child?), and "Number of groups unknown" (tickets £15 each, £60 total, number of children?).