Three-digit addition

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Steps in this unit · Three-digit add and subtract

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Three-digit add and subtract · Numbers & Operations

Add and subtract three-digit numbers, then mixed expressions.

This is step 1 of unit 1, “Three-digit add and subtract”, in Stage 4: Multiplying, dividing and first fractions (ages 10). 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.