Double-Digit Addition

This past week we have been beginning to learn how to add double-digit numbers, such as 45 + 6. To give students an opportunity to visualize how this works, we started by using our base ten blocks and a work mat for our tens and ones.

Students looked at the addition examples in their math books and began solving by building the first number in the problem. So, in the case of 45 + 6 they would first build 45 on their tens and ones mat. Once they built that, they would add the 6 to their work mats. Then they needed to think, “do I need to regroup the ones or not?” In this case they would realize that they have more than ten ones in the ones place so they do, in fact, need to regroup. Using these manipulatives, the students could visually decipher how to solve these types of problems and why or when they need to regroup the ones into the tens place. Great job solving these addition problems students, you did an excellent job this week!