A short elementary maths teaching video in which presenter Rebecca demonstrates the formal column method for adding two-digit numbers without regrouping. Using base-10 concrete materials and a place-value chart, Rebecca works through the example 34 + 22 by adding ones (4 + 2 = 6) and tens (30 + 20 = 50) to reach 56, and states the final answer that Minnell has 56 stickers.
Questions this video answers
34 + 22 = 56
Rebecca
Rob Langman
2024-04-04
Chapters
Hi, I'm Rebecca. And in this film we're going to look at formal methods for addition. So let's have a look at a problem. Min Elle has 34 stickers, and her sister gives her 22 more stickers. How many stickers does she have altogether? Now, when you first start teaching addition like this, it's a really good idea to use concrete apparatus. And here I've got the base 10 materials to help. So I'm going to do the formal method alongside it. You. You can see on our base 10 that we have 34 in our tens and ones column. So I'm going to put tens and ones, and then I'm going to put the number 34 in. And then underneath you can see we're adding 22. And in the place value chart, I have my 22 with the base 10. So I'm going to add that into the column underneath. Now, if we use our base 10 materials to add up, you can see that in the ones column, we've got four plus another two, which would give us six. And then in the tens column, we have 30, plus another 20, which would give us 50. We can move over to our formal method four, add two is six and 30 add 20 is 50, which gives us the answer of 56. And we can return to our final question to say that Minnell has 56 stickers altogether. So that's our formal method for addition.