Final answer:
Barbara can substitute 3 1/3 tablespoons with 10 teaspoons, since there are 3 teaspoons in 1 tablespoon.
Step-by-step explanation:
If Barbara needs to use 3 1/3 tablespoons for a recipe but only has a teaspoon measure, she needs to convert tablespoons to teaspoons. Normally, there are 3 teaspoons in 1 tablespoon. To find the total number of teaspoons required, she would calculate as follows:
- Convert 1/3 of a tablespoon to teaspoons by multiplying it by 3, which equals 1 teaspoon.
- Now, multiply the whole number of tablespoons (3) by 3 to get 9 teaspoons.
- Add the number of teaspoons from steps 1 and 2 together (9 teaspoons + 1 teaspoon) to find the total needed, which is 10 teaspoons.
Therefore, Barbara should use 10 teaspoons to replace the 3 1/3 tablespoons the recipe calls for.