SAT · Student-produced responses
SAT grid-in questions
About a quarter of the Math questions ask you to type a number rather than choose from four options. College Board calls these student-produced responses; almost everyone else calls them grid-in questions, a name carried over from the paper test. The mathematics is no harder, but the entry rules are specific, and answers that are mathematically correct are marked wrong every year because of how they were typed.
Where SAT grid-in questions appear
Student-produced responses fall near the end of each Math module rather than being scattered through it. In a 22-question module, roughly the last five or six are of this kind.
Because they cluster at the end, running short of time in the Math section costs you these questions specifically. They are also the questions where guessing does not help: there are no options, so an answer typed at random is almost certainly wrong. That makes reaching them worth planning for.
SAT grid-in entry rules
Your answer may be up to five characters for a positive value and up to six for a negative one, counting the minus sign. Anything longer is truncated, which usually makes it wrong.
Fractions and decimals are both accepted, and neither is preferred. If your answer is 7/2, you may type 7/2 or 3.5. Both are marked correct.
If a fraction will not fit in the character limit, type the decimal equivalent instead. If a decimal will not fit, truncate it or round it at the fourth digit, and do not round earlier than that. An answer of 2/3 may be typed as 2/3, or as .6666, or as .6667. It may not be typed as .67.
Mixed numbers are not accepted. An answer of three and a half must be typed as 7/2 or as 3.5, never as 3 1/2, which the system reads as thirty-one halves.
Do not type symbols. No percent sign, no dollar sign, no comma, no unit. An answer of $1,200 is typed 1200.
If more than one value satisfies the question, enter only one of them. Entering two is marked wrong even when both are correct.
SAT rounding rules for grid-in answers
The rule is a single one, and it is stricter than most candidates assume: round or truncate at the fourth digit, never earlier. A repeating decimal such as 0.666… is correct as .6666 and correct as .6667, and wrong as .67 or .667.
This catches people who round the way they would in class, to two decimal places. The character limit is what determines how much you can enter, not the tidiness of the number, so fill the space you have.
Common SAT grid-in mistakes
Rounding too early. A question whose answer is 0.666… becomes wrong when typed as 0.67, because the instructions ask for four digits and .67 is only two. When in doubt, give more digits rather than fewer.
Typing the unit. A question asking for a length in centimetres wants the number alone. Adding cm exceeds the character limit and is not read as part of a number.
Answering the wrong quantity. With no options to check against, there is nothing to catch a slip. A system of equations gives both x and y, and a ratio problem gives the share, the other share and the difference between them. Read the last line of the question again before typing.
Leaving it blank. A wrong answer costs nothing, so a plausible number is better than nothing at all. If your working produced a value and you are unsure whether it answers the question asked, type it.
Entering negative answers on the SAT
The minus sign counts as one of your six characters. An answer of −11/3 takes five, which fits; an answer of −0.66667 takes eight, which does not and must be shortened to −.6666 or −.6667.
The leading zero in a decimal may be dropped, and doing so frees a character. Both 0.5 and .5 are accepted.
SAT practice test
Our Math module includes grid-in questions with the same entry and rounding rules.
Start practice →