Clean subtraction practice with results that never dip below zero, from single-digit differences to multi-digit columns. Answer key included on its own page.
The generator keeps every running difference non-negative, so early learners never meet a negative number by accident. Pick single digits for fact practice or push the width up for column-subtraction drills.
Print two copies of the same sheet for a fair race, or reseed for a fresh sheet of identical difficulty — the seed is what changes the problems, the settings are what change the level.