How do I stop making careless mistakes on SAT® Math?

You stop them by giving them a name. A mistake you call “careless” can’t be fixed, because the only advice it allows is “be more careful”. Almost every careless SAT Math mistake is one of a handful of specific habits, and a specific habit has a specific fix.

Why “be more careful” doesn’t work

When you review a wrong answer and decide it was carelessness, you close the case without learning anything. The next week the same thing happens on a question that looks completely different, and it feels like bad luck again. It isn’t. The test is built so that the most common wrong paths lead to an answer choice. If your wrong answer is sitting there among the options, someone predicted exactly what you would do.

The habits that cause most “careless” losses are few: solving for a different quantity than the one asked; dropping a negative sign when distributing; mixing units (minutes and hours, per item and total); and stopping one step early because an intermediate result appears in the choices.

One example

This is not carelessness. It is one precise habit: stopping at the variable when the question asks for an expression. The test places x as a choice on purpose, because it knows most students solve for x out of habit.

The fix is a rule, not attention

Once the habit has a name, the fix is mechanical. For this one: before you choose, reread the last line of the question and underline what it asks for. If it asks for 2x + 1, your final step must produce 2x + 1. Five seconds, every time, and this whole family of mistakes disappears.

The other habits have their own rules. Signs: distribute the negative to every term inside the parentheses, and write it down instead of doing it in your head. Units: write the unit next to every number in word problems. Early stops: if your answer came quickly on a hard question, check whether it is a middle step.

How to find your own

Take your last ten wrong answers in math. For each one, write a single sentence that describes the step where you went off track — not the right answer, the step. If three sentences look alike, that is your habit, and it is worth more than any new chapter of content. Most students find that two habits account for most of their lost points.

This happens to a lot of people. What you don't know yet is whether it happens to you, and with which one. Sixteen questions will tell you.

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