Second grade is a very important year where students develop fluency with two-digit addition and subtraction . It is the year that we work on a multitude of addition and subtraction strategies that students can use to solve problems. We spend a lot of time discussing a variety of strategies, using many different models, and doing mental math.

Nowhere in those two standards does it say anything about the standard algorithm that we all learned in school (most likely with the language of “carry” and “borrow”), nor is the standard algorithm directly addressed in the Second Grade Common Core Standards. Read to the end to find out how I address the standard algorithm in our classroom.

If you are familiar with my Addition & Subtraction Word Problems, you may have noticed that I make a big distinction between the strategies used when solving problems and the models students employ with those strategies. Strategies are usually how students approach and manipulate the numbers. Models are how the strategies are organized on paper so that students can explain or see the strategy.

We need to know a lot of different facts, rules, formulas, and techniques for the Quant portion of the test, but there are 4 math strategies that can be used over and over again, across any type of math—algebra, geometry, word problems, and so on.

How did you do the problem? Most Quant questions have more than one possible approach and this one is no exception—but I want to use this problem to talk about a particular technique called Testing Cases .

This question is called a “theory” question: there are just variables, no real numbers, and the answer depends on some characteristic of a category of numbers, not a specific number or set of numbers. When we have these kinds of questions, we can use theory to solve—but that can get very confusing very quickly. Instead, try testing real numbers to “prove” the theory to yourself.

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Teaching Channel's videos help teachers get better at teaching--no matter where they are in their careers. By licensing our videos, your users get unlimited access to these unparalleled tools for a period of one year. To request more information:

Teaching Channel is a thriving online community where teachers can watch , share , and learn diverse techniques to help every student grow.

Start exploring Singapore Math, the number sense instruction that it revolves around and how number sense and computation the Singapore way can help you reach your students. You’ll learn about Singapore’s number sense instruction in detail as you learn to integrate number sense into every computation by building a solid foundation on concrete, pictorial, and abstract number sense activities.

Learn how Singapore Math brings place value instruction to life with place value mats and disks. If you and your students love games, you're sure to enjoy this concrete way of learning about place value! Then learn three impressive Singapore Math addition strategies starting with single-digit problems and moving to multi-digit problems and problems requiring regrouping.

Help students transition from manipulatives to algorithms using their number sense as a guide as you learn about branching, left-to-right addition, and vertical addition. Then you’ll go back to your place value mats as you focus on subtraction.

Second grade is a very important year where students develop fluency with two-digit addition and subtraction . It is the year that we work on a multitude of addition and subtraction strategies that students can use to solve problems. We spend a lot of time discussing a variety of strategies, using many different models, and doing mental math.

Nowhere in those two standards does it say anything about the standard algorithm that we all learned in school (most likely with the language of “carry” and “borrow”), nor is the standard algorithm directly addressed in the Second Grade Common Core Standards. Read to the end to find out how I address the standard algorithm in our classroom.

If you are familiar with my Addition & Subtraction Word Problems, you may have noticed that I make a big distinction between the strategies used when solving problems and the models students employ with those strategies. Strategies are usually how students approach and manipulate the numbers. Models are how the strategies are organized on paper so that students can explain or see the strategy.

Second grade is a very important year where students develop fluency with two-digit addition and subtraction . It is the year that we work on a multitude of addition and subtraction strategies that students can use to solve problems. We spend a lot of time discussing a variety of strategies, using many different models, and doing mental math.

Nowhere in those two standards does it say anything about the standard algorithm that we all learned in school (most likely with the language of “carry” and “borrow”), nor is the standard algorithm directly addressed in the Second Grade Common Core Standards. Read to the end to find out how I address the standard algorithm in our classroom.

If you are familiar with my Addition & Subtraction Word Problems, you may have noticed that I make a big distinction between the strategies used when solving problems and the models students employ with those strategies. Strategies are usually how students approach and manipulate the numbers. Models are how the strategies are organized on paper so that students can explain or see the strategy.

We need to know a lot of different facts, rules, formulas, and techniques for the Quant portion of the test, but there are 4 math strategies that can be used over and over again, across any type of math—algebra, geometry, word problems, and so on.

How did you do the problem? Most Quant questions have more than one possible approach and this one is no exception—but I want to use this problem to talk about a particular technique called Testing Cases .

This question is called a “theory” question: there are just variables, no real numbers, and the answer depends on some characteristic of a category of numbers, not a specific number or set of numbers. When we have these kinds of questions, we can use theory to solve—but that can get very confusing very quickly. Instead, try testing real numbers to “prove” the theory to yourself.

Fluently add and subtract within 1000 using strategies and algorithms based on place value, properties of operations, and/or the relationship between addition and subtraction.

Teaching Channel's videos help teachers get better at teaching--no matter where they are in their careers. By licensing our videos, your users get unlimited access to these unparalleled tools for a period of one year. To request more information:

Teaching Channel is a thriving online community where teachers can watch , share , and learn diverse techniques to help every student grow.

We need to know a lot of different facts, rules, formulas, and techniques for the Quant portion of the test, but there are 4 math strategies that can be used over and over again, across any type of math—algebra, geometry, word problems, and so on.

How did you do the problem? Most Quant questions have more than one possible approach and this one is no exception—but I want to use this problem to talk about a particular technique called Testing Cases .

This question is called a “theory” question: there are just variables, no real numbers, and the answer depends on some characteristic of a category of numbers, not a specific number or set of numbers. When we have these kinds of questions, we can use theory to solve—but that can get very confusing very quickly. Instead, try testing real numbers to “prove” the theory to yourself.