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~10 min
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About this worksheet
A one-minute fluency sprint: 48 subtraction facts within 20 and a “Score ___ / 48” box at the bottom. Set a timer, let the child work down the columns, and mark where they stopped.
Run the same sheet once a week and the score becomes a simple progress record. The point is not to finish, it is to see the number climb, so keep the timer honest and the mood light.