Step 3 / 3
Teen plus a digit
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Teen plus a digit · Numbers & Operations
If you know 3 + 4 = 7, you know 13 + 4 = 17. Add the ones, then add the ten.
This is step 3 of unit 19, “Teen plus a digit”, in Stage 1: Numbers to 20, adding and subtracting (ages 6–7). A round has 8 problems; 90% or better earns three stars. Everything is free with no sign-up, and your stars and XP are saved on this device.