This is algebra that proves "9 + 10 = 21" to be correct! just click stage to see it in words This actually doesn't work, and you can see why in the other costume for the sprite in the coding!
this is the way i know of 9+10=21. i did not make this up, i just heard it in my school. my friend showed this to me this is just 4 fun so please dont get mad if you dont agree with 9+10=21 i added a rainbow in the 21 because it isnt good without a rainbow :)