Which pair makes it?

Joining · Numbers & Operations

Join two numbers like domino dots to make 11 to 19.

This is step 3 of unit 15, “Joining”, 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.