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Guide

How to check a number before you publish

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For this guide and its prompts we recommend:

  • Fireflies.ai gives you the transcript. Free plan (source)
  • Gamma lets you put a short source line under every figure on a slide. Free plan (source)
  • OpusClip makes the captions you read through for numbers. Free plan (source)

Offers checked 21 Oct 2026

You can now catch invented numbers before publishing.

Every number in a post, page, deck or video has one source you have opened yourself, and the check takes about ten minutes.

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What you need

Sandra, a Kailiniai hero
  • The draft you want to publish
  • Any AI chat assistant
  • A spreadsheet or a simple list for the sources
  • Ten quiet minutes
  • Fireflies.aiYou work from what was really saidFree plan
  • GammaA laid-out deck or page from an outlineFree plan
  • OpusClipOne recording becomes several captioned clipsFree plan

Steps

  1. Find every number first

    Prices, dates, sizes, times, percentages, counts. Ask the assistant to list them in a table, because it is good at finding them. It is not a source: it only finds, you check.

  2. Give each number one source

    The page, document, invoice or measurement it came from, with the date you read it. One source per number is enough, if it is the original.

    Weak

    Delivery takes two days.

    Better

    Delivery takes [two] working days. Source: the courier’s delivery page, checked on [date].

  3. Open the source and compare exactly

    Same unit, same currency, same date, same conditions. “From”, “up to” and “per month” change what a number means.

  4. No source in ten minutes? Take it out

    Remove the number, or say the point in words without a figure. A sentence without a number is better than a number you cannot back up.

  5. Treat numbers you did not give as invented

    Any figure the AI added on its own is made up until you find it in a source. Delete it if you cannot.

  6. Keep the source list with the post

    Save the table next to the draft. When someone asks, or when you update the post, the check takes a minute.

The full instruction

Copy it into any AI chat assistant and change only the first line.

Change only this line: TEXT_TYPE = [a blog post about winter coat care]

You help me check the numbers in my TEXT_TYPE before I publish it. You find, I verify.
Below I paste my draft, then the numbers I gave you myself with their sources (or "none").

Do three things:
1. TABLE: list every number and every claim that sounds like a fact (prices, dates, sizes, percentages, counts, "most", "fastest"). For each, write the exact sentence it appears in.
2. SOURCE NEEDED: for each line, say what kind of source would prove it (an official price page, an invoice, my own measurement) and mark [NO SOURCE?] where I have not given one.
3. INVENTED: mark every number that does not appear in what I gave you as [INVENTED?].

Do not check the numbers yourself, do not suggest new numbers and do not fill gaps. Start with the table.

Paste your material below this line:

What you end up with

A draft where every number has one source you opened yourself, a short source list saved with it, and no figure the AI made up.

Common mistakes

  • Asking the AI whether a number is right instead of opening the source yourself.
  • Using a page that copies the number instead of the original source.
  • Keeping a number because it sounds good, after ten minutes without a source.
  • Checking the text but not the numbers in the picture, slide or video caption.

Processes that need more than one tool

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Each process below uses several tools, each for the job it does best. Any AI chat assistant works where one is named.

  1. Find, then check

    Tools, in order: any AI chat assistant → a spreadsheet

    1. Ask the assistant to list every number in the draft with the sentence it appears in.
    2. Copy the list into a spreadsheet and add two columns: the source link and the date you checked.
    3. Delete or rewrite every line that still has no source after ten minutes.

    The prompt for this process

    You help me find every number in my draft. You find, I check.
My draft: [paste]
Make a table with three columns: the number, the exact sentence it appears in, and the kind of source that would prove it.
Mark every number I did not give you as [INVENTED?].
Do not check the numbers yourself and do not suggest new ones.
Start with the table.

  2. Numbers said in a meeting

    Tools, in order: Fireflies → any AI chat assistant

    1. Take the transcript of the call from Fireflies, recorded with everyone’s consent.
    2. Ask the assistant to quote the exact sentence where each number was said.
    3. Check each number against the document it should come from before it goes into a post.

    The prompt for this process

    You help me find where each number was said in a meeting transcript.
The transcript (personal details removed): [paste]
The numbers I want to use: [list]
For each number, quote the exact sentence where it was said and who said it by role, not by name.
If a number does not appear in the transcript, write [NOT SAID?].
Start with the first number on my list.

  3. A deck with a source under every figure

    Tools, in order: a spreadsheet → Gamma

    1. Keep the checked numbers and their sources in one spreadsheet.
    2. Put each figure on a Gamma slide with a short source line under it, and nothing that is not in the sheet.

    The prompt for this process

    You help me write short source lines for the figures in a deck.
My checked figures and their sources: [paste: figure, source, date checked]
The slides they go on: [list]
For each figure, write the slide line and a source line under it, under 12 words.
Use only the figures I listed; leave out anything without a source.
Start with the first slide.

  4. Numbers in video captions

    Tools, in order: OpusClip → a spreadsheet

    1. Make the captions in OpusClip and read them through.
    2. Check every number in the captions against your source sheet before you post the clip.

    The prompt for this process

    You help me check the numbers in my video captions.
The caption text: [paste]
My checked numbers and sources: [paste]
List every number in the captions and say whether it matches a number on my list exactly, including unit and date.
Mark anything that does not match as [CHECK?].
Start with the first caption line.

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