SAT Math: Unit Conversion
22+ practice questions in Praczo
The concept, explained
- 1
To convert units, multiply by a conversion factor written as a fraction equal to 1: e.g., (1 hour / 60 minutes).
- 2
Set up the chain so unwanted units cancel diagonally. If you want meters, put meters in the numerator.
- 3
For area conversions, square the linear conversion factor: 1 ft = 12 in, so 1 ft² = 144 in².
- 4
For rate conversions, convert numerator and denominator separately then simplify.
- 5
Always identify what unit the final answer should be in before setting up the chain.
- ✗ Multiplying instead of dividing (or vice versa): to go from inches to feet, divide by 12, not multiply.
- ✗ Forgetting to square the conversion factor for area problems.
SAT-style practice
A car travels at 60 miles per hour. What is its speed in feet per second? (1 mile = 5,280 feet)
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