Stage 1 · Unit 21 / 30 · Numbers & Operations
Adding zero
Adding zero changes nothing: 12 + 0 = 12 and 0 + 15 = 15.
★ 0 / 3 · 0/1 steps done
▶ Start · Step 1Adding zero changes nothing: 12 + 0 = 12 and 0 + 15 = 15.
★ 0 / 3 · 0/1 steps done
▶ Start · Step 1