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Lesson 9: Intro to addition with 2-digit numbers

# Adding 2-digit numbers without regrouping

## Want to join the conversation?

• 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 maximum amount of numbers you can put in an addition or subtraction problem like this?
(1 vote)
• 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.
• 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!! :)
• this is so easy I covered this in first grade.
• I did this in pre k
(1 vote)
• Can you regroup any number?
(1 vote)
• You can regroup any number greater than 10. For example: 84 is 8 tens and 4 ones.