Final answer:
To find out how many more miles Tolay needs to bicycle, subtract the distance she has already bicycled from the total distance she needs to travel: 15.345 miles - 5.6 miles = 9.745 miles.
Step-by-step explanation:
Tolay is bicycling 15.345 miles to her grandma's house. She has already bicycled 5.6 miles. To find out how many more miles Tolay needs to bicycle, we need to subtract the distance she has already bicycled from the total distance she needs to travel. Subtraction can be used to find the difference between two numbers. So, we can subtract 5.6 miles from 15.345 miles to find the remaining distance Tolay needs to bicycle.
15.345 miles - 5.6 miles = 9.745 miles
Tolay needs to bicycle approximately 9.745 miles more to reach her grandma's house.