Exam 2: Subtraction of Whole Numbers

In a two digit whole number the second column from the right in the number represents units.

Subtract the following numbers to obtain the difference: 538 - 42 =

A house has 3,450 sq ft of floor space and is divided into 3 heating/cooling zones. The first zone, the upstairs, has 1,122 sq ft. The main living area is the second zone covering 1,525 sq ft of space. The third zone is the basement where the recreation room, laundry, half bath, and home shop are located. How much floor space is included in the third zone in square feet?

An installer has 109 strap hangers in the truck. On a job, 45 straps are used on hot water supply lines and 33 on return lines. The installer also uses 12 straps on an electrical conduit that carries wires to the furnace. Find the number of straps that are left in the truck.

When subtracting two numbers it is sometimes necessary to borrow from the number in the adjacent column.

A full oil tank holds 290 gallons of #2 fuel oil. During 5 months, the amounts of fuel oil used are: 8 gallons, 24 gallons, 32 gallons, 91 gallons, and 105 gallons. How many gallons of fuel oil are left in the tank?

A cylinder containing refrigerant R-134a weighs 28 pounds. When empty, the cylinder weighs 6 pounds. How many pounds of R-134a are in the cylinder?

Subtract the following numbers to obtain the difference: 3,972 - 1,028 =

Subtract the following numbers to obtain the difference: 4,250 feet - 975 feet

Two rooms needs 42 feet of electric baseboard heaters. Lengths of 9 feet, 8 feet, 7 feet, and 7 feet are already placed. What length of baseboard heater in feet still must be placed?