Number Matrices
Find the arithmetic relationship in a grid, then choose the missing number.
Add two numbers.
Six questions · Five choices · No time limit
Example
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Find the missing number
Use the same rule in each row or column, as stated.
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Keyboard: 1–5 to choose · Enter to check or continue
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How this data is usedHow to practise
Read the stated direction. Find an arithmetic rule that works in both complete rows or columns, then use that rule to fill the missing cell. Choose one answer, check the explanation, and continue when ready.
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Learn a method
Use two complete linesFind the arithmetic relationship in a grid, then choose the missing number.
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Optional and off by default. Share starts, completions, replays and error categories. For visits from ChatGPT, starts and completions can also include the first QuickenBrain page and broad country. No answers, drawings or names.
How this data is used