# Teaching and Mastering 2-Digit Addition  Adding 2 digit numbers is an important skill that students must learn. This can be done using different strategies, including counting by ones and tens and regrouping.

The first step is to teach students about the place value of ones and tens. Then, students can arrange numbers column-wise to make them easier to add.

## Counting by tens

Counting by tens is one of the first steps in learning 2 digit addition. This skill is important for understanding how to add numbers like 71 and 67. It is also essential for completing more complex addition problems that require regrouping.

It is best to introduce this skill slowly by using a number line or place value chart. Depending on your student’s level, you may want to use concrete, or hands-on, manipulatives until students are comfortable with this concept. Then, you can move on to representational, or drawn, manipulatives.

Once students have mastered counting by tens, they can start to practice adding 2-digit numbers with regrouping. This can be done by playing SplashLearn’s games. The fun games will help them understand the process and become experts at adding even complex numbers. Students will learn to add without a pencil and get rewarded for each correct answer they give. This will help them build confidence in their skills and make them feel accomplished.

## Counting by ones

Counting by ones is an important skill for children to develop when adding 2-digit numbers. This is the first step in a series of skills that children need to learn before they can move on to more complicated addition strategies.

One strategy to teach this is using a number line or hundreds chart with the smaller addends highlighted. This is a great way to help students identify the place value of each addend and encourages them to count on to find the larger sum. Another way to practice this is by preparing a set of ‘one more’ and ‘one less’ cards with the addition problem written on each card.

You may also want to try introducing this addition strategy with base ten blocks as this makes it easy for kids to see the individual addends and how they combine to make a total. This will also give kids an opportunity to practice separating the tens and ones in the problems, which can be hard for some children when they are first introduced to this strategy.

## Regrouping

Teaching children to add two-digit numbers using regrouping is a critical skill. However, it can be difficult for students to grasp. This is because the process of regrouping requires a good understanding of place value. It is important to teach your students the underlying concept of place value before introducing them to this method.

Teaching place value with manipulatives is an effective way to make this concept more concrete for your students. For example, you can use base ten blocks to help them visualize how the addition process works. You can also teach your students to represent numbers with grid lines. This will help them remember that each digit has its own place in the number.

Once your students have mastered adding two-digit numbers with regrouping, you can move on to subtraction. This is best done when the minuend (the number being subtracted) has a zero in the ones place. It is then easier for your students to break down the problem and solve it using the standard algorithm.

## Estimating

Students need to understand that adding a number can be done in different ways. This helps them adapt to a variety of problem types and gives them freedom when working with 2-digit addition. For example, if one student learns to use the break apart method for subtraction, they can continue to use it when they are adding 2-digit numbers together.

Developing estimation skills is also important when teaching 2-digit addition with regrouping. Students can use activities such as Wait! Let’s Estimate to look at a problem and estimate how many ones will be in the answer, or how many tens will be in the answer. This helps them self-check their answers and ensures that they are using the correct strategy.

Before tackling 2 digit addition with regrouping, students should have a solid understanding of place value. This can be taught through various anchor charts and math manipulatives. Using base ten blocks is especially helpful because it makes it easy for children to see how regrouping works.

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