Regrouping one hundred as 10 tens in subtraction (2nd grade math)
In this lesson, we deal with 3-digit subtraction, and there is only ONE regrouping: a hundred is regrouped with the tens.
We first look at a visual model to understand how regrouping works, and then go on to the regular subtraction algorithm (one number written under the other).
The second part of the lesson deals with some word problems and puzzles. :)
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See also
Mental addition of two-digit numbers
Math Mammoth Grade 2 curriculum