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Fractions, Decimals, and Percentages Flashcards

6 cards from real IBEW practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

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  1. An electrician's hourly wage is $32.00. After a union negotiation, they receive a 4.5% raise. What is their new hourly wage?

    Answer: $33.44

    To find the raise amount, multiply the original wage by the percentage expressed as a decimal: $32.00 * 0.045 = $1.44. Then, add the raise amount to the original wage to find the new hourly rate: $32.00 + $1.44 = $33.44.

  2. An electrical plan has several measurements listed for the required spacing between conduits. Which of the following values is the largest?

    Answer: 2/3 inch

    To compare the values directly, convert them all to decimals: 5/8 = 0.625; 0.620 is already a decimal; 65% = 0.65; and 2/3 is approximately 0.667. Comparing these decimal values, 0.667 is the largest.

  3. A 500-foot spool of wire has had 3/8 of its length used for a rough-in. How many feet of wire remain on the spool?

    Answer: 312.5 feet

    First, determine the fraction of wire remaining, which is 1 - 3/8 = 5/8. Then, multiply the total length by this fraction: 500 feet * (5/8) = 2500 / 8 = 312.5 feet. Alternatively, calculate the used portion (500 * 3/8 = 187.5) and subtract it from the total (500 - 187.5 = 312.5).

  4. A blueprint requires a hole to be drilled with a diameter of 7/16 inches. What is this measurement expressed as a decimal?

    Answer: 0.4375

    To convert a fraction to a decimal, the numerator is divided by the denominator. In this case, 7 divided by 16 equals 0.4375.

  5. An electrical supply house offers a 15% discount on a bulk order of fixtures that costs $860.00. After the discount, a 6% sales tax is applied. What is the final total cost?

    Answer: $774.86

    First, calculate the discount amount: $860.00 * 0.15 = $129.00. Subtract this from the original price: $860.00 - $129.00 = $731.00. This is the new subtotal. Now, calculate the sales tax on this subtotal: $731.00 * 0.06 = $43.86. Finally, add the tax to the discounted price: $731.00 + $43.86 = $774.86.

  6. An apprentice correctly terminates 45 out of 50 wires in a control panel. What percentage of the wires were terminated correctly?

    Answer: 90%

    To find the percentage, create a fraction of the correctly terminated wires over the total number of wires, which is 45/50. To convert this fraction to a percentage, divide the numerator by the denominator (45 ÷ 50 = 0.9) and then multiply the result by 100 (0.9 * 100 = 90%).