Reply to How are we supposed to teach addition and subtraction?

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[quote=Anonymous][quote=Anonymous]Side question… if you do the 30+50 and the 5+1 method, how do you explain what happens on the next problem when the sum of the two ones-place digits exceeds nine?

37 + 58 =
30 + 50 = 80
7 + 8 = 15

It seems to me that now you’re back to explaining the same principle as moving that little 1 up to the tens column.

Although I agree with PP that learning different ways to see problems helps solidify a deeper understanding.[/quote]

You explain that the next step is to add 80+15, just as the child would add the two sums together even if the second sum was not double digits. There's no breaking down and regrouping the three and eight as you would if you were to do the borrowing method.

--OP, I do both. I think the above is a great place for kids to start learning the concept of place value and the relationship between the numbers. But, as a child gets into multi-digit problems, that there are many times where regrouping or borrowing will be easier to use.[/quote]

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