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Math “Find the Mistake” Warm-Up Generator

A worked problem with one intentional error — spot it, fix it, then check the correct solution.

Filter by topic

Uncheck a topic to leave it out of both the projector shuffle and the worksheet generator.

Filter by grade band

Same idea by level — scope the bank to elementary, middle, or high school problems. Both filters apply together.

Find the Mistake

Name: __________________________   Date: __________

Each problem below has one mistake in the worked solution. Find it, explain it, and write the correct answer.

Answer Key

    Add a problem

    Import many problems

    Paste one problem per line: problem, shown work (with the mistake), correct fix, explanation, separated by tabs (a spreadsheet paste) or commas. A header row is optional. Put several steps in one cell with <br>, or wrap the cell in double quotes and use real line breaks. An optional fifth column is the topic and a sixth the grade band. Nothing is saved until you have previewed it and pressed the add button.

    What to do with them

    Full bank (0 problems)

    Built-in problems can’t be deleted, but you can disable one to leave it out of the projector and worksheet. Only your own custom problems can be deleted.