First I show with a visual model how, in adding two 3-digit numbers, we may get more than 10 tens, and those are then regrouped with the hundreds (we get an extra hundred). I soon tie the visual model in with the usual way of writing one number under the other. Later in the lesson I also show what happens when we add 3 numbers, and the sum of the tens exceeds 20. We also look at just a few mental math problems: 80 + 70, and how we can use that result to also solve 280 + 70 and 580 + 70. Lastly there is a PUZZLE to solve, once again, which makes Mathy so happy! See other 2nd grade math videos at
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A few word problems for 2nd grade math. One involves both addition and subtraction (3-digit). Another, once again, lacks the actual question so Mathy and I discuss that for a while. Lastly we will do some missing number puzzles (3-digit subtraction, with regrouping). The first part of the lesson teaches regrouping one hundred as 10 tens (in subtraction), and it is found here:
A few word problems for 2nd grade math. One involves both addition and subtraction (3-digit). Another, once again, lacks the actual question so Mathy and I discuss that for a while. Lastly we will do some missing number puzzles (3-digit subtraction, with regrouping). The first part of the lesson teaches regrouping one hundred as 10 tens (in subtraction), and it is found here:
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). This lesson is meant for 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). This lesson is meant for 2nd grade math.
First I use a visual model (like base ten blocks) to explain how regrouping twice works when adding 3-digit numbers. Then we look at how that process works when adding the numbers the usual way (one number written under the other). We also solve some word problems and puzzles. This lesson is meant for 2nd or 3rd grade math. Find more 2nd grade math videos at
First I use a visual model (like base ten blocks) to explain how regrouping twice works when adding 3-digit numbers. Then we look at how that process works when adding the numbers the usual way (one number written under the other). We also solve some word problems and puzzles. This lesson is meant for 2nd or 3rd grade math. Find more 2nd grade math videos at
More practice and examples of regrouping (borrowing) in subtraction, with 2-digit numbers. I also show and emphasize the importance of checking your answer by ADDING. Check out this video to show your child the basics of how regrouping in subtraction with 2-digit numbers works:
More practice and examples of regrouping (borrowing) in subtraction, with 2-digit numbers. I also show and emphasize the importance of checking your answer by ADDING. Check out this video to show your child the basics of how regrouping in subtraction with 2-digit numbers works:
First I show with a visual model what REGROUPING actually means in itself (before we get into subtracting). One TEN is "broken down" into TEN ONES. We practice that concept with an example, changing 7 tens 6 ones into 6 tens 16 ones (the regrouping process). Then I also involve subtraction. We regroup (aka borrow), then subtract 2-digit numbers. Before showing the regular way this is written down (with one number under the other), I use a model based on place value for a few exercises. For example: 7 tens 0 ones is regrouped as 6 tens 10 ones. Then we subtract: 6 tens 10 ones - 4 tens 8 ones ---------------------------- 2 tens 2 ones Lastly we get into the regular way of writing the subtraction, such as 62 - 27 --------- Check out other 2nd grade math videos at
First I show with a visual model what REGROUPING actually means in itself (before we get into subtracting). One TEN is "broken down" into TEN ONES. We practice that concept with an example, changing 7 tens 6 ones into 6 tens 16 ones (the regrouping process). Then I also involve subtraction. We regroup (aka borrow), then subtract 2-digit numbers. Before showing the regular way this is written down (with one number under the other), I use a model based on place value for a few exercises. For example: 7 tens 0 ones is regrouped as 6 tens 10 ones. Then we subtract: 6 tens 10 ones - 4 tens 8 ones ---------------------------- 2 tens 2 ones Lastly we get into the regular way of writing the subtraction, such as 62 - 27 --------- Check out other 2nd grade math videos at