Your brother travelled 117 miles in 2,25 hours to come home for school work. what's the average speed that he was traveling?

117miles  / 2.25 hours = 52 miles per hour

This law is sometimes called the grouping property. as you can see, regardless of how the numbers are grouped, the answer is still 13. the associative law of multiplication is similar to the same law for addition. it says that no matter how you group numbers you are multiplying together, you will get the same answer.