Double Number Lines


Work Time


Ratios are important in cooking. No matter what amount you make, you need to use the right ratio of ingredients in a recipe for the dish to taste the same every time.

Suppose that the recipe for an oil-and-vinegar dressing requires 6 tablespoons of salad oil and 2 tablespoons of vinegar.

  • Create a double number line that shows this relationship. Use the Double Number Line Tool if you find it to be helpful.
  • Use your double number line to determine how many tablespoons of salad oil you would need if you had 1 tablespoon of vinegar.
  • How many tablespoons of vinegar would you need if you had 15 tablespoons of salad oil?


INTERACTIVE: Double Number Line Tool

What number on the line representing the vinegar should you line up with the 6 on the line representing the salad oil?