Step 1 / 8

Tens plus ones

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For 20 + 4, add the ones 0 and 4, then write the tens digit 2.

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Example

Solve it.

Answer: 63

Steps in this unit · Two-digit addition

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← Count the pieces Tens and ones plus ones →

Two-digit addition · Numbers & Operations

Add the ones, then the tens. Solve no-carry addition in columns too.

For 20 + 4, add the ones 0 and 4, then write the tens digit 2.

This is step 1 of unit 30, “Two-digit addition”, in Stage 2: Numbers to 100, carrying and borrowing (ages 7–8). 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.