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:3,972 – 1,028 =

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?

An air-conditioning shop orders the following amounts of refrigerant: 115 pounds of R-134a, 157 pounds of R-125, 65 pounds of R-124, 95 pounds of R-32, and 90 pounds of R-152a. What is the total weight in pounds of refrigerant ordered?

Add the following numbers to obtain the correct sum.983 + 351 =

When multiplying two numbers, do not forget to include the units in the answer.

A fuel oil tank, when filled, weighs 2,024 pounds. It stands on 4 legs. What weight in pounds must the floor support under each leg; that is, what is the weight each leg supports?

In the number 3,567,890, the digit 9 is in the hundreds place.

Add the following numbers to obtain the correct sum.2,377 + 512 + 1,893 + 384 =

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.