Parentheses, then exponents, then multiply and divide left to right, then add and subtract left to right. 3 + 4 × 5 is 23, not 35. The ACT writes the expression so a rushed left to right fails. Exponents themselves are in exponent rules.
Left to right inside a tier
24 ÷ 4 × 2 is 12, not 3. Multiply and divide share a level. Add and subtract share a level. Absolute value bars act like parentheses, in absolute value. Fraction bars also group: the entire numerator is one piece.
Place value is not order of operations, but a decimal in the wrong place will still wreck the value, in decimals and place value. Formulas that assume this order are in ACT Math formulas.
The bottom line
Group first, powers next, then × and ÷ in the order they appear, then + and − in the order they appear.
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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.