Short answer: Read tape measure fractions by identifying the units and tick spacing, reading the whole inches and adding the remaining fraction. Write the unit with the answer and repeat the reading from the same reference points. Practice the arithmetic on a desk before using dimensions for an assigned task.
Read the scale you actually have
Inspect the tape’s smallest interval first. In these exercises, one inch has sixteen equal intervals. The eighth tick is 8/16 = 1/2 inch, the fourth is 4/16 = 1/4 inch and the twelfth is 12/16 = 3/4 inch.
NIST’s units table gives 12 inches = 1 foot. Keep feet and inches distinct from decimal feet: 1.5 feet equals 18 inches.
Add the whole number and the fraction
A mark at seven inches plus eleven of sixteen intervals reads 7 11/16 inches. Keep that fractional part with the whole number.
To add 3/8 inch and 5/16 inch, use a common denominator:
- 3/8 = 6/16.
- 6/16 + 5/16 = 11/16 inch.
- Reverse check: 11/16 – 5/16 = 6/16 = 3/8 inch.
To convert 2 feet 3 inches, calculate 2 x 12 + 3 = 27 inches.
Repeat from the same reference points
For a practice object, state the start point, endpoint and unit aloud. Read again and compare the written value with the scale.
Ask the trainer how the actual task handles tolerances, the tape’s hook and the measurement reference. Use the assigned supervision when transferring a measurement to a cut or installation.
Read and repeat a practice dimension
Read and repeat a practice dimension
Use a desk practice object and state the reference points before reading its length.
- I identified the units and smallest interval
- I stated the two measurement reference points
- I read the whole inches before the fraction
- I wrote the unit with my answer
- I repeated the reading and checked the arithmetic
Keep the reference points with the measurement
Write both readings with their units so you can check whether the same dimension was measured.
Practice object | Reference points | First reading | Repeat reading | Unit | Question for trainer —|—|—|—|—|— | | | | |
Solve three inch-and-fraction questions
1. How many inches are in 2 feet 3 inches?
- A. 23 inches
- B. 27 inches
- C. 24 inches
2. What is 3/8 + 5/16 inch?
- A. 11/16 inch
- B. 8/24 inch
- C. 8/16 inch
3. A sixteenths scale shows seven whole inches plus eleven ticks. Which reading preserves the scale?
- A. 7.11 inches
- B. 7 11/8 inches
- C. 7 11/16 inches
Solve three inch-and-fraction questions: answers
- B. 2 x 12 + 3 = 27; 23 combines the written digits and 24 drops the final three inches.
- A. Convert 3/8 to 6/16 first, then add the numerators.
- C. Eleven ticks represent eleven sixteenths in this exercise.
Record the tape your trainer actually asks you to bring. The US$19 Texas First-Year Electrical Apprentice Kit includes employer questions about required tools, a Tool budget sheet (CSV) and a Tool inventory sheet (CSV). Use the confirmed requirement to plan the purchase and add the item to your list.
How do I convert decimal feet?
Multiply by twelve to get inches; 1.5 feet gives eighteen inches.
What should I confirm before a real layout?
Confirm the reference points, tolerance and use of the tape’s hook with the trainer for the assigned task.
