Step 1 / 2
Three numbers within 20
★★★Loading…
Steps in this unit · Add and subtract together
Add and subtract together · Numbers & Operations
When one line has both + and −, work from left to right.
This is step 1 of unit 4, “Add and subtract together”, in Stage 2: Carrying, borrowing and numbers to 100 (ages 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.