Mental Arithmetic: work the following exercises in your head. Do not calculate with a pencil or paper. Do not use a

decimal.

Think of the number seven.

Now add eight to it.

Now add four more.

Now subtract nine.

Now add three.

Your answer is

14

13

12

11

Express each ratio as a unit rate. Round to the nearest tenth, if necessary. 400 feet in 52.4 seconds a. 76 feet per second c. 7.7 feet per second b. 0.76 foot per second d. 7.6 feet per second

Oceanside Bike Rental Shop charges a sixteen dollar fixed fee plus seven dollars an hour for renting a bike. Alyssa paid seventy-two dollars to rent a bike. How many hours did she pay to have the bike checked out?

Find the right quotient. 36m^5 n^5 / (12m^3)

How much water should we add to 35 kg of sugar syrup to change its concentration from 30% to 25%?

8 (x + 1) - 3 (x + 4) = 7 (2 - x)

Ms. Liebowitz has a choice of driving or flying from Morgantown, West Virginia to Washington, D. C. for a one-day business trip. If she travels by air, she will be able to work seven hours in D. C.

Which scenario describes a situation where X varies directly with y

3 Select the correct answer. A square field was enlarged by adding 5 feet to the length and width of the original field. If the area of the enlarged field is 576 square feet, what was the side length of the original field? A. 29 feet 19 feet C.

What is 1 and 1/4 + 1 and 1/2

Which value can be added to the set below without changing its mean? {4, 10, 14, 18, 22, 22} 0 15 16 22