I want to learn about: Addition and Subtraction

In today’s post we’re going to learn to add using the Rekenrek abacus to help us. We saw in a previous post that the rekenrek is a flexible learning material because it can be adapted to different calculation strategies. Today we’re going to talk in detail about how to use the rekenrek to help demonstrate some of the […]

In today’s entry, we’re going to talk about some of the exercises that appear during the Smartick daily sessions. They may appear complex and convoluted at times, but they have great didactic potential. They are exercises that require the student to complete a basic operation (addition, subtraction, multiplication, or division). These activities help the student understand different […]

In today’s post, we’re going to take a look at some strategies for solving problems that involve incomplete horizontal additions and subtractions, using examples to help us. Acquiring mental calculation strategies is not always easy, since there’s no defined “best method” for everyone, and it can be frustrating if you don’t pick it up quickly. […]

Do you know how to solve a subtraction problem with regrouping? Do you know how regrouping is done and why? Today we are going to review how to subtract by regrouping and understand why it is done this way. So that we can picture it better, we are going to do a subtraction with regrouping […]

In this post, we are going to learn how to round and use estimation in subtraction problems. Mastering this skill is helpful in verifying that an exact answer is of the correct order of magnitude and also in determining whether an answer is reasonable or not. Round and Estimating Subtraction Problems in Tens Round the […]

In today’s post, we are going to review vertical subtraction. As always, we are going to review with examples that will help us to understand what vertical subtraction consists of and how to solve such problems. Before we begin, let’s review the material that we’ll use to subtract. We’ll use individual cubes to represent 1s. […]

In today’s post, we are going to learn how to add with regrouping.  Addition with regrouping consists of addition problems where the answer to the calculation is 10 or a bigger number. For example, 6 + 7 = 13 The steps to solve regrouping addition problems are the following: If the column being added doesn’t […]

In this post, we are going to learn a strategy for adding two consecutive numbers, or in other words, numbers that are one value apart. And a strategy for adding numbers that are two values apart. Adding Strategy Adding two consecutive numbers This strategy consists in first doubling the smaller number then adding one to […]

In this post, we will learn to estimate a sum. Do you know what estimating a sum can help us with? When we have to do an operation mentally, often we do not need the exact result but an estimate of the outcome. Other times, after we have done an operation on paper and want to […]