Convert every measurement into one unit before you compute. ACT Math puts the trap in a mixed pair: minutes with hours, or centimeters with meters. How to write the equation once the units match is in setting up word problems.
One direction at a time
Multiply when you go from a larger unit to a smaller one if you want the count of small units: 2 hours × 60 = 120 minutes. Divide when you go the other way: 150 minutes is 2.5 hours. A rate of 30 miles per hour for 90 minutes is not 30 × 90. It is 30 miles per hour times 1.5 hours.
Square and cubic units scale by the square or the cube of the length factor. 1 meter is 100 centimeters, so 1 square meter is 10,000 square centimeters, not 100.
Where mixed units hide
Mixture problems often combine amounts that were stated in different units. Those are in mixture problems. Speed setups that mix minutes and hours are in rate problems. Powers of ten, which are a conversion in disguise, are in scientific notation.
The bottom line
Pick one unit, convert everything into it, then calculate. Check that the answer's unit matches what the question asked for.
Start practicing
Start with a free diagnostic, then drill your weak spots with 15-question quizzes and track how you're doing across Reading, English, and Math. Compare plans whenever you're ready to go further.
This article offers general ACT prep guidance. The ACT can change from year to year, including its format, scoring, policies, test dates, and fees, so always confirm the latest details on the official ACT website at act.org before you make decisions. ACT® is a registered trademark of ACT, Inc. thirty-six is not affiliated with, endorsed by, or sponsored by ACT.