Let's break down the problem:

1. The recipe requires 64 grams of chocolate powder.
2. Laura knows that 1 cup of the chocolate powder weighs 128 grams.
3. Laura added $\frac{2}{3}$ of a cup.

Now, let's calculate how much chocolate powder Laura added:

• $\frac{2}{3}$ of 1 cup weighs $\frac{2}{3} \times 128 = \frac{256}{3} \approx 85.33$ grams.

Next, compare this amount to the 64 grams the recipe requires:

• Laura added approximately 85.33 grams, but the recipe only calls for 64 grams.
• Therefore, she added more than the recipe requires.

Now, let's find by how much she went over:

• $85.33 - 64 = 21.33$ grams extra.

To convert this extra amount into cups, recall that 1 cup is 128 grams:

• $\frac{21.33}{128} \approx \frac{1}{6}$ of a cup.

So, Laura went over by $\frac{1}{6}$ of a cup.

Correct Answer: She went over by one over six of a cup.

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Do you want more details or have any questions?

Here are 5 related questions:

1. How much chocolate powder is in $\frac{1}{4}$ of a cup?
2. If the recipe called for 96 grams of chocolate, how much would Laura need to add?
3. What fraction of a cup should Laura have added to use exactly 64 grams of chocolate?
4. If Laura added $\frac{1}{2}$ of a cup, would she need to add more powder?
5. How would the calculations change if the cup measured 150 grams instead?

Tip: Always verify units when working with weights and volumes to ensure accurate measurements in cooking.