7.4 Exercise 90

Cooking time Helen bought a $\text{24}-\text{pound}$ turkey for her family’s Thanksgiving dinner and wants to know what time to put the turkey in the oven. She wants to allow $20$ minutes per pound cooking time.

1. ⓐ Calculate the length of time needed to roast the turkey by multiplying $24 \cdot 20$ to find the number of minutes and then multiplying the product by $\frac{1}{60}$ to convert minutes into hours.

2. ⓑ Multiply $24 \left(20 \cdot \frac{1}{60}\right) .$

3. ⓒ Which of the Properties of Real Numbers allows you to multiply $24 \left(20 \cdot \frac{1}{60}\right)$ instead of $\left(24 \cdot 20\right) \frac{1}{60} ?$