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Three numbers within 30
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Add and subtract together · Numbers & Operations
When one line has both + and −, work from left to right.
This is step 2 of unit 4, “Add and subtract together”, 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.