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Guide for math teachers

Partial credit for handwritten math — how an AI grader finds the slip on the page

To give partial credit on handwritten math, a grader has to read the student’s own working, find the first line that no longer follows, and award the marks for the correct steps before it. MathSense AI transcribes each student’s handwriting line by line from a scan or photo, judges each answer on a 0–10 scale and converts it to the question’s point value, re-checks purely numeric lines with a separate arithmetic check, and drafts feedback that names the broken step. You review every score and comment before a student sees anything.

Updated October 11, 2026 · Published by MathSense AI (L8O LLC)

Why partial credit depends on reading the handwriting

A final answer can be checked against a key. Partial credit cannot: it depends on the lines in between, which only exist in the student’s handwriting. Pencil fades, students cross things out, and the work for question 4 sometimes ends up under question 6. Any grader — human or software — has to read the actual page.

How MathSense AI reads the page

  1. Transcription in reading order

    Each page is transcribed line by line, including equations. Printed text and red teacher marks are ignored; faint pencil is contrast-enhanced.

  2. A second look

    A second pass checks the transcription against the page before anything is scored.

  3. The right question

    Work is paired with its question by label, page order and sub-question part. An ambiguous label is flagged for you, not guessed.

  4. Judged, then converted to your points

    Each answer is judged on a 0–10 scale and converted to that question’s point value — so a correct method with a slip earns part of the marks.

  5. The arithmetic check

    A separate rule-based check re-computes purely numeric lines, including order of operations, and names the slip in the feedback.

What you see on the results page

  • The student’s work beside each question, with the drafted score out of that question’s points.
  • A score you can change for every question, and feedback you can edit.
  • An annotated copy of the paper with the comments placed beside the work, and a printable feedback sheet, once you approve.

Where to review closely

Very faint, smudged or cramped handwriting; work that continues somewhere unexpected on the page without a label; and anything students draw rather than write. Printed figures are shown with each question, but drawn work and proofs are not yet a tested part of grading — review those by hand.

What partial credit looks like on a handwritten answer

Correct factoring, correct setup of the two cases, then the signs flip in the last line. The first two lines earn their credit; the feedback names the third.

Illustrative example — simulated student work.

Question (4 points): Solve x² − 5x + 6 = 0.

Student work

(x − 2)(x − 3) = 0

x − 2 = 0 or x − 3 = 0

x = −2 or x = −3

Score: judged 5/10 → 2 of 4 points

Drafted feedback: The factoring is right — (x − 2)(x − 3) = 0 — and setting each bracket to zero is the correct next step. Solving them, x − 2 = 0 gives x = 2 and x − 3 = 0 gives x = 3; the signs flipped in the last line.

You approve or edit it before the student sees anything.

How MathSense AI helps

  • “By paper twenty I am grading the final answer and nothing else.”

    Every paper gets the same step-by-step reading, so the twentieth student’s method earns the same credit as the first.

  • “I cannot tell a slip from a misunderstanding at a glance.”

    The feedback names the line where the work broke and what the correct step was — you decide whether to keep the drafted score.

  • “Students lose their work when I write on it.”

    The original stays as uploaded; comments go on an annotated copy and a printable feedback sheet.

Try it on your own papers

Your first assignment is graded free — up to 5 student papers, no credit card required. You review every grade.

See plans

Questions

How does an AI grader give partial credit on handwritten math?
It transcribes the student’s working line by line, finds where the reasoning breaks, judges the answer on a 0–10 scale and converts that to the question’s point value. MathSense AI also re-checks purely numeric lines with a separate arithmetic check, and you review every score.
Does it work with pencil and phone photos?
Yes. Upload a PDF, PNG, JPG or WebP — a scan or a phone photo. Faint pencil is contrast-enhanced and a second pass checks the transcription against the page. Very faint or cramped handwriting is still worth reviewing closely.
What if the student answered out of order?
Each piece of work is matched to its question using the question labels, page order and sub-question parts. When a label is ambiguous the match is flagged for you rather than guessed.
Can I change the partial credit it suggests?
Yes. Every question’s score and every comment can be changed before you approve the paper, and nothing reaches a student until you do.