Self-Test C-1.1.1: Add, Subtract, Multiply and Divide Whole Numbers, Fractions, Decimals and Percentages

Complete Self-Test C-1.1.1 and check your answers.

1. A site services contractor has 6 backhoe/loaders, 8 skid steer loaders, 4 excavators, 2 compactors and 3 de-watering rigs. How many pieces of equipment are employed on this site?

Answer:                                                                                                                   

2. If 187 PEX fittings are removed from a box shipped from the supplier with 300 fittings, how many fittings remain in the box?

Answer:                                                                                                                   

3. A construction job had 87 pipefitters. One day 9 pipefitters were transferred to another site. Three days later, 12 were transferred. On the fifth day, 3 quit. How many fitters were left on the job to finish the install?

Answer:                                                                                                                   

4. If we cut a piece of black iron pipe 21 ft. long into four pieces, the first 3.5 ft. long, the second 5.5 ft. long and the third 8 ft. long, what is the length of the remaining piece?

5. A roll of PEX tubing is 1000 ft. long. If a 130-ft. piece is cut from each end, and two pieces 175 ft. and 188 ft. long are also cut, what is the length of the remaining roll?

6. A wooden laminated beam weighs 41 lb. per foot. If the length of the beam is 22 ft., how much does the beam weigh?

7. A load of black iron pipe contains a total of 3024 feet. If each pipe is 21 ft. long, how many lengths of pipe were shipped to the wholesaler?

8. A sprinkler fitter used 42 pieces of 8-ft. pipe and 13 pieces of 16-ft. pipe. How many feet of pipe did he use?

9. The following pump schedule is found at a mine site. When the four pumps are operating as designed, what is the total number of US gallons/minute they will pump from the site?

• Pump 1 – 125 US gpm
• Pump 2 – 220 US gpm
• Pump 3 – 175 US gpm
• Pump 4 – 275 US gpm

Answer:                                                                                                                    gpm

10. A gas fitter needs 12 three-piece pipe hanging brackets fabricated out of angle iron. If the three sides of each bracket measure 200 mm × 283 mm × 200 mm, how much angle iron will be required?

Answer:                                                                                                                    mm

11. A drum of boiler treatment contains 50 gallons. If it takes 80 days to empty the drum, how many quarts per day are being used? (There are 4 quarts in a gallon.)

Answer:                                                                                                                    quarts

12. A 150-litre container of lawn fertilizer is fed to an underground lawn sprinkler. If it takes 17 days to empty the container, how many litres per day are being used?

Answer:                                                                                                                    litres

13. A length of 3-inch schedule 40 black iron pipe measures 21 ft. 8 in. long. Coupons 10 in. in length are cut from this pipe for welding practice. Disregarding any cutting losses, how many coupons can be cut from this length of pipe?

Answer:                                                                                                                   

14. Divide 1275 by 28 and multiply the quotient by 52.

Answer:                                                                                                                   

Answer Key: Self-Test C-1.1.1 is on the other page.