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# Adding 2-digit numbers without regrouping

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• What if you group the numbers before addition
• It would be the same concept except backwards, you would still get the same answers. 800+50+3=853 358=300+50+8
• Is there a thousands cube and a millions cube?
• Yes, the thousandths cube is a cube with 10 100's, but I have never seen a millions cube. I think they should make those!! :)
• Is there a maximum amount of numbers you can put in an addition or subtraction problem like this?
• Yes, it is infinite. You can have 0 + 0 + 0 + 0 and keep going forever. But if you don't count zeros, I would say there are a maximum 9. That is 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1 + 1. Or that could also include 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11 + 11. But if you want different single digits in one equation you can have a maximum of 3 without regrouping. That is 1 + 2 + 3 or 1 + 2 + 4 or 1 + 3 + 4. There are many possibilities.