The Digital SAT math section is adaptive: your performance on Module 1 determines the difficulty of Module 2. That means early mistakes compound. Here are the 10 most common errors and how to fix each one.
1. Misreading the question. The SAT loves asking for 2x instead of x, or the value of an expression rather than a variable. Circle what the question actually asks before solving.
2. Sign errors in algebra. When distributing negatives or moving terms across the equals sign, write out every step. Speed kills accuracy here.
3. Forgetting to check extraneous solutions. Radical and rational equations can produce answers that don't satisfy the original equation. Always plug back in.
4. Confusing percent increase with percent of. A 20% increase on 50 is 60, not 10. Read carefully whether the question asks for the new value or the change.
5. Mixing up slope and y-intercept. In y = mx + b, m is the rate of change and b is the starting value. Word problems test whether you know which is which.
6. Ignoring units. If a rate is in miles per hour and time is in minutes, convert before calculating. The SAT includes wrong answers that use mismatched units.
7. Not using the answer choices. On multiple choice, sometimes plugging in each answer is faster than solving algebraically. Start with C (the middle value) to narrow down.
8. Overthinking geometry. Most SAT geometry problems use only a few formulas. If your solution requires advanced techniques, you probably missed a simpler approach.
9. Rushing through data interpretation. Tables and graphs require careful reading of axes, labels, and scales. Spend 10 extra seconds understanding the data before answering.
10. Skipping the calculator when it helps. The Digital SAT provides Desmos. Use it to graph functions, check solutions, and verify calculations.