Final answer:
Mary will halve her casserole recipe using measuring cups, for instance, using 1/2 cup instead of 1 cup of corn. Understanding unit conversion is crucial, as shown in Marcy's beef example where she uses 750 grams out of 1.5 kilograms. For large scale preparations like Devon's soup for 100 guests, multiplication helps to find the total liters needed.
Step-by-step explanation:
Mary is looking to cut her mother's sweet potato casserole recipe in half for a smaller serving size suitable for her and her son. She will use measuring cups to accurately measure the ingredients by volume or capacity. For instance, if the original recipe calls for 1 cup of corn, Mary will now use 1/2 cup. Similarly, if the recipe specified an amount in grams, like 1500 grams of meat but she only needs half, she would use 750 grams.
It's important to remember the relationships between units of measurements as well, such as 1000 grams being equivalent to 1 kilogram, as seen in Marcy's case where she has 1.5 kilograms, or 1500 grams, of beef and only needs 900 grams for her beef stew recipe, leaving her with 600 grams leftover.
In another example, for a catering event with 100 guests where typically 375 milliliters of soup is served per person, Devon would need to calculate that she'll be preparing 37.5 liters of soup in total for the event.