Question

Limited time, please answer in the next 5 minuets.  Anna drove at a constant rate of 63 miles per hour for 3.2 hours. She determined she drove 201.6 miles. Which 

best  explains the reasonableness of Anna’s answer? a. There are three digits to the left of the decimal in the factors and three digits to the left of the decimal in the answer, so Anna’s answer is reasonable.b. There is one digit to the right of the decimal in the factors and one digit to the right of the decimal in the answer, so Anna’s answer is reasonable. c. Anna’s answer is reasonable because  is 180, and 180 is reasonably close to 201.6.

d. Anna’s answer is reasonable because  is 280, and 280 is reasonably close to 201.6.

Answer 1

I think its the first one. Because 60x5 is 180 and thats reasonably close to 201.6
Let me know if its right!

Answer 2

C.

Explanation:

We know that the distance is given by the formula

Distance=speed*time

Speed=63 mph

time=3.2 hours

Hence Distance = 63*3.2 =201.6 miles

Now if we round of the two figures to its near tenth digit and multiply we get

60 * 3 =180

and 180 is close to 201.6 , Hence Hanna answer is reasonable