 # Subtract within 100 - Strategies (Grade 2)

Related Topics:
Lesson Plans and Worksheets for Grade 2
Lesson Plans and Worksheets for all Grades

Videos, songs, examples, and solutions 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

### 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)

### Using Base-10 Blocks

Subtraction to 100 (Without Regrouping)
Subtraction using base-10 blocks. Subtraction to 100 (With Regrouping)
Subtraction using base-10 blocks.

### Split Strategy

Subtracting by Breaking over 10
This video reviews a strategy called breaking over 10. This strategy breaks a subtraction problem up into two easier subtraction problems by splitting the subtraction over a group of 10. This strategy is written here but should ultimately be done with mental math when you have a double digit number minus a single digit number. Subtraction - Split Strategy
This tutorial will show you how to solve 2 digit by 2 digit subtraction problems using the Split Strategy.

### Jump Strategy or Number Line

Subtraction - Jump Strategy
This tutorial will show you how to solve 2 digit by 2 digit subtraction problems using the Jump Strategy or Empty Number Line.

Subtraction Number line Number Line Subtraction
Use the number line to subtract (or actually add) to find the difference between two numbers. The Arrow Way Subtraction
This video demonstrates how the arrow way can be used as a written recording method for subtraction.

### Compensation

Compensation Strategy with Subtraction
This video gives concrete and pictorial examples of the compensation strategy for subtraction.
14 - 9, 24 - 19, 92 - 79 Compensation Strategy with Subtraction Part 2
This video gives an example of the compensation strategy for subtraction where a quantity is subtracted from both numbers. It also gives an example of when NOT to use the compensation strategy.
41 - 22, 46 - 22 Compensation Strategy Subtraction Subtraction with Compensation
How to subtract difficult or large numbers using compensation method? 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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