To find the whole in a part-whole problem, multiply the value of one part by the total number of parts. Draw a bar model and label it to illustrate the problem. The ratio of toffees to truffles is ...

We can also show this as a part-whole model and a bar model. Each way of showing the calculation shows part + part = whole. 75 is the whole number and 43 and 32 are the parts. When a number is ...