Final answer:
Stephanie needs to add 1 31/70 more cups of flour to her recipe. To find this, we converted the mixed numbers to improper fractions, found a common denominator, and subtracted the amount already added from the total required, simplifying the result to a mixed number.
Step-by-step explanation:
To calculate how many more cups of flour Stephanie needs for her bread recipe, which calls for 5 1/7 cups, and with her having already added 3 7/10 cups, we'll need to subtract the amount she has added from the total required.
First, we convert the mixed numbers into improper fractions. For 5 1/7 cups, we have (5 × 7) + 1 = 35 + 1 = 36/7 cups. For 3 7/10 cups, we have (3 × 10) + 7 = 30 + 7 = 37/10 cups. Now we need to find a common denominator to subtract these two fractions. The common denominator for 7 and 10 is 70. This converts 36/7 to 360/70 and 37/10 to 259/70.
The difference is: 360/70 cups - 259/70 cups = 101/70 cups. To simplify this fraction, we convert 101/70 cups back into a mixed number, which is 1 31/70 cups. Therefore, Stephanie needs to add 1 31/70 more cups of flour to follow the recipe accurately.