Grid-in question

Definition

A grid-in (sometimes called a free-response or student-produced response) is a math question where you enter your numerical answer directly rather than selecting from multiple-choice options. On the SHSAT math section, a small number of questions are grid-ins; the rest are multiple-choice.

How grid-ins work

On the paper-based SHSAT, the answer sheet has a grid with rows of digits 0–9, plus columns for placing each digit. The student writes the answer in the boxes at the top of the grid (for human readability) and bubbles in the corresponding digits below (for machine scoring).

On the digital SHSAT-CAT, grid-ins are entered through an on-screen number pad. You type your numerical answer; the system records what you typed.

Examples of grid-in questions

Grid-ins tend to be questions where the answer is a specific integer, decimal, or fraction:

• “If 3x + 7 = 22, what is x?” Answer: 5
• “The mean of 4 numbers is 12. If three of the numbers are 8, 11, and 15, what is the fourth?” Answer: 14
• “A rectangle has width 6 and area 42. What is its perimeter?” Answer: 26

Why grid-ins are often harder than multiple-choice

On multiple-choice questions, you can sometimes work backward from the answer choices, eliminate clearly wrong options, or check your work by plugging answers in. Grid-ins remove all of these options. You have to actually solve the problem and arrive at the exact correct answer. There’s no “close enough” partial credit.

For students, this means:

• You can’t guess productively. Random guessing on grid-ins has near-zero probability of getting the right answer. (Random guessing on multiple-choice is 25%.)
• Arithmetic errors are unforgiving. If you do the algebra correctly but make a computation error at the end, the grid-in is wrong with no partial credit.
• You can’t verify by elimination. Multiple-choice often gives clues; grid-ins don’t.

Common grid-in mistakes

The most common grid-in errors students make:

• Forgetting to express the answer in the requested form. If the question asks for a decimal and you enter a fraction (or vice versa), the answer may be marked wrong.
• Rounding errors. If the actual answer is 2.5 and you enter 2 or 3, it’s wrong. Some grid-ins require exact answers.
• Leading zeros. Entering “05” instead of “5” sometimes causes problems on automated scoring. The on-screen number pad usually handles this gracefully, but verify your input.
• Misreading the question. Grid-ins force precise computation, and students who misread what the question asks for (e.g., x instead of x squared, perimeter instead of area) get clean wrong answers with no hint that they made the error.

Strategy for grid-ins

A few practical approaches:

• Re-read the question after solving. Make sure you’re answering exactly what was asked.
• Double-check arithmetic. The cost of one error is high. Quick verification is worth the time.
• If you’re close on time, prioritize multiple-choice. Multiple-choice gives you 25% chance of being right even without solving. Grid-ins give you near-zero. If you’re forced to skip questions, skipping grid-ins costs less in expectation.
• Sanity-check the answer. If you compute that a person’s age is −7 or that a length is 2,500 feet for a small object, you made an error somewhere.

Pre-CAT vs CAT grid-ins

The pre-2024 paper SHSAT had a distinct “grid-in” section with about 5 questions in this format. The CAT format integrates grid-ins more flexibly — any individual question might be presented in grid-in or multiple-choice format depending on the test design. The general principle is the same: enter your numerical answer directly when prompted.