Step 1 / 3
3+4 and 13+4
★★★If 3 + 4 = 7 then 13 + 4 = 17: add the ones and keep the ten.
Addition Village · Learn first
Example
Use the first line to fill in the box.
1 + 7 = 8
11 + 7 =
Answer: 18
Teen plus a digit · Numbers & Operations
If you know 3 + 4 = 7, you know 13 + 4 = 17. Add the ones, then add the ten.
If 3 + 4 = 7 then 13 + 4 = 17: add the ones and keep the ten.
This is step 1 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.