Stella 100

with Devin the Otter

Hi! I'm Devin the Otter. Let's splash through some subtraction!

Stella 100

🔢100 subtraction problems
⏱️8 minutes 30 seconds on the clock
⌨️Type your answer, then press Enter
🐚Stuck? Press Skip. It comes back at the end.

8:30

Problem 1 of 100

13−7=

Great work!

Ones to practice

All 100 problems

✓ right ✗ wrong — blank ⏰ after time was up

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