Step 3 / 3
Missing number
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Subtract within 20 · Numbers & Operations
No-borrow subtraction, then borrowing from the ten, then missing numbers.
This is step 3 of unit 2, “Subtract within 20”, in Stage 2: Carrying, borrowing and numbers to 100 (ages 8). A round has 10 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.