Answer:
https://www.khanacademy.org
Step-by-step explanation:
Khan Academy is free and you can choose by grade level or course. It's a personalized learning experience with videos and practice exercises that includes progress tracking.
Answer:
459
Step-by-step explanation:
27 x 17= 459
Example:
38 rounds to 40
6 rounds to 10
10+40 = 50
