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 use a part-whole model to show the two groups and the total of 20. We can use a bar model to show this calculation. Or a ten frame. By using a ten frame you can easily see that 20 is made ...