Ratios and proportions
Lesson 10 of 20 in Union Aptitude Prep. The start plays free here.
- Compare two wire lengths
- One amount: the first length
- Another amount: the second length
- Ratio: same units
- Rate: different units
- Test: 2/3 = 4/6
- Cross products: 3 × 4 and 6 × 2
- 12 = 12: true proportion
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- Algebra & functions with worked steps
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How the lesson starts
You want to compare the lengths of two wires. A ratio is a comparison of two amounts. Here, those amounts are the wire lengths.
You compare 2 feet of wire with 3 feet of wire. Both quantities use feet. That comparison is a ratio.
Then, in the full lesson
- Different units
- Test the equality
- Multiply diagonally
- Equal products
- 2 questions along the way
A question from this lesson
You compare wire lengths and work hours. Which comparison is a rate?
- 12 feet to 3 hours
- 12 feet to 3 feet
- 12 hours to 3 hours
Show the answer
A. 12 feet to 3 hours. 12 feet to 3 hours compares different units, so it is a rate. Feet compared with feet and hours compared with hours use the same units, so those are ratios.
The full class, $39 once.
Paid once, no subscription. Ask for a refund within 7 days of buying if you’ve done less than 25% of the class.
- Number series trainer
- Algebra & functions with worked steps
- Reading comprehension sets
Not affiliated with IBEW, NECA, ETA or any JATC. Original practice questions only.