Step 1 / 4
Two-digit + one-digit
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Two-digit addition · Numbers & Operations
Add two-digit numbers, without and with carrying, then three numbers.
This is step 1 of unit 1, “Two-digit addition”, in Stage 3: Two-digit sums and times tables (ages 9). 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.