Family practice
The factor is hidden in the target amount.
Optional until a teacher marks it
| cups of flour | batches |
|---|---|
| 2 | 5 |
| 4 | ? |
Mei uses 2 cups of flour for every 5 batches at the cooking lab. The same relationship has to hold for a larger amount.
A ratio problem hides the factor inside a target amount. Dividing the target by the matching part of the base ratio reveals the factor. That factor, not the difference, scales the other part. Working backward uses the same relationship.
Problem 1 of 8. What we learned, an example, a few together, then independent practice.
| cups of flour | batches |
|---|---|
| 2 | 5 |
| 4 | ? |
A ratio table shows 2 cups of flour for every 5 batches. How many batches go with 4 cups of flour?
Support frame: Factor = 4 ÷ 2. Second part = 5 × factor.