Math Help From the 2nd-Grade Team

Addition and Subtraction Strategies (2-Digit)

• Place Value

  • Adding using place value

  • Adding 3, 2-digit numbers using base ten blocks

  • Adding three 2-digit numbers using a place value chart

• Break Apart to Make A Ten

  • Make a Ten

  • Homework Example 1

  • Homework Example 2 (including skip counting)

• Number Line

  • Using a Number line for Addition 

  • Review of Numberline

• Expanded Form

  • Expanded Form

• Homework Example (compare Addition strategies: Make a Ten and Expanded Form)

• Homework Example 2 (compare Subtraction strategies: Add it Up and Expanded Form)

Strategies for Solving Word Problems

• Part-Part-Whole

  • Identifying Parts vs. Wholes

  • Part-Part-Whole Word Problem Homework Example

  • Two Step Story Problems

  • Solving for an Unknown Addend

    • Solving for an Unkown Addend Part 2

Adding 3-digit numbers

• Adding using Expanded Form Method 

Subtracting 3-digit numbers

• Using Place Value strategy 

• Using Proof Drawings to subtract

• Using Expanded Form to subtract

Balance Equations

• Practice Balancing Equations with this website - click on Number Balance KS2

Using a Hundreds Board

• Adding and subtracting with the hundreds chart

Place Value

• Comparing Numbers

Adding Doubles plus 1

• ​video

Skip Counting

• video (start at 5 min mark)

• video 2 (need Learnzillion account - it's free!)

• video 3 (skip counting on the numberline)

Comparing and Ordering Numbers

• video 1