Add within 100 - Strategies (Grade 2)
Videos, solutions, examples, and songs to help Grade 2 students learn to fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Common Core: 2.NBT.5
Related Topics:
Subtract within 100, More Lessons for Grade 2, Common Core for Grade 2
Addition using base-10 blocks
Examples:
43 + 21 =
35 + 52 =
27 + 51 =
Addition to 100 (With Regrouping)
Addition using base-10 blocks
Examples:
45 + 45 =
25 + 59 =
58 + 35 =
This tutorial will show you how to solve 2-digit by 2-digit addition problems using the Jump Method or Empty Number Line.
Example:
23 + 45 =
How to add on a number line using the jump strategy?
Examples:
32 + 26 =
Addition using Open Number Line
Examples:
37 + 25 =
324 + 316 =
This tutorial will show you how to solve 2 digit by 2 digit addition problems using the Split Method.
Example:
54 + 73 =
Splitting Strategy - Addition
A strategy for solving double-digit addition by splitting the numbers into tens and ones.
Examples:
1. There are 23 boys and 25 girls in the lunch room. How many children are in the lunch room?
2. Evan has 45 jelly beans. His friend gave him 43 more jelly beans. How many jelly beans does Evan have now?
Two Digit Addition Strategies - Breaking Apart by Place Value
Example:
32 + 50 =
Addition - Partial Sums (Pictorial and Abstract)
Examples:
38 + 29 =
349 + 175 =
This tutorial will show you how to use the compensation strategy to help you to solve addition problems.
Example:
55 + 19 =
160 + 61 =
Compensation Strategy for Addition
This video shows the compensation strategy for addition modeled concretely and using number bonds.
Example:
35 + 56 =
Compensation Strategy Addition
Example:
28 + 19 =
The Arrow Way Addition
This video demonstrates the written recording method know as "the arrow way."
Example:
25 + 12 =
Addition Strategies
This video for teachers and parents are just a few mental math strategies for double digit addition. There are many variations of these strategies and you should use the one that makes the most sense to you. Alternative Addition Strategies
A quick math video for parents to help you learn the strategies that your child learned in school
Base-10 Blocks, Chunking or Jumps or Number Line, Compensation, Place Value.
Example:
64 + 35 =
2nd Grade Addition and Subtraction Strategies
This video for parents and teachers shows the following strategies:
Regroup or borrow
Decompose
Cross Number Puzzle
Use or Draw Base-10 Blocks
Solve using Money
2.NBT.5
The Common Core State Standards (CCSS) videos are designed to support states, schools, and teachers in the implementation of the CCSS. Each video is an audiovisual resource that focuses on one or more specific standards and usually includes examples/illustrations geared to enhancing understanding. The intent of each content-focused video is to clarify the meaning of the individual standard rather than to be a guide on how to teach each standard although the examples can be adapted for instructional use.
Common Core: 2.NBT.5
Suggested Learning Target
- I can add and subtract numbers within 100 with ease by applying strategies (e.g., decomposing numbers into tens and ones, using commutative and associative properties, using mental strategies) based on the numbers being added or subtracted.)
- I know the addition and subtraction fact families
- I can model regrouping using base ten manipulatives (e.g., base ten blocks, Digi-Blocks, place value arrow cards)
- I know that when regrouping, the value of the number does not change but the place values of the digits within that number change (e.g., When regrouping the problem 324 – 116, 324 becomes 300 + 10 + 14 in order to regroup)
Related Topics:
Subtract within 100, More Lessons for Grade 2, Common Core for Grade 2
Use Base-10 Blocks
Addition to 100 (Without Regrouping)Addition using base-10 blocks
Examples:
43 + 21 =
35 + 52 =
27 + 51 =
Addition to 100 (With Regrouping)
Addition using base-10 blocks
Examples:
45 + 45 =
25 + 59 =
58 + 35 =
Jump Strategy or Number Line
Addition - Jump StrategyThis tutorial will show you how to solve 2-digit by 2-digit addition problems using the Jump Method or Empty Number Line.
Example:
23 + 45 =
Examples:
32 + 26 =
Addition using Open Number Line
Examples:
37 + 25 =
324 + 316 =
Split Strategy
Addition - Split StrategyThis tutorial will show you how to solve 2 digit by 2 digit addition problems using the Split Method.
Example:
54 + 73 =
Splitting Strategy - Addition
A strategy for solving double-digit addition by splitting the numbers into tens and ones.
Examples:
1. There are 23 boys and 25 girls in the lunch room. How many children are in the lunch room?
2. Evan has 45 jelly beans. His friend gave him 43 more jelly beans. How many jelly beans does Evan have now?
Two Digit Addition Strategies - Breaking Apart by Place Value
Example:
32 + 50 =
Addition - Partial Sums (Pictorial and Abstract)
Examples:
38 + 29 =
349 + 175 =
Compensation Strategy
Addition - Compensation StrategyThis tutorial will show you how to use the compensation strategy to help you to solve addition problems.
Example:
55 + 19 =
160 + 61 =
Compensation Strategy for Addition
This video shows the compensation strategy for addition modeled concretely and using number bonds.
Example:
35 + 56 =
Compensation Strategy Addition
Example:
28 + 19 =
The Arrow Way Addition
This video demonstrates the written recording method know as "the arrow way."
Example:
25 + 12 =
Summary of the Strategies for Parents & Teachers
Addition Strategies
This video for teachers and parents are just a few mental math strategies for double digit addition. There are many variations of these strategies and you should use the one that makes the most sense to you. Alternative Addition Strategies
A quick math video for parents to help you learn the strategies that your child learned in school
Base-10 Blocks, Chunking or Jumps or Number Line, Compensation, Place Value.
Example:
64 + 35 =
2nd Grade Addition and Subtraction Strategies
This video for parents and teachers shows the following strategies:
Regroup or borrow
Decompose
Cross Number Puzzle
Use or Draw Base-10 Blocks
Solve using Money
2.NBT.5
The Common Core State Standards (CCSS) videos are designed to support states, schools, and teachers in the implementation of the CCSS. Each video is an audiovisual resource that focuses on one or more specific standards and usually includes examples/illustrations geared to enhancing understanding. The intent of each content-focused video is to clarify the meaning of the individual standard rather than to be a guide on how to teach each standard although the examples can be adapted for instructional use.
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