2.NBT.1 Adding and Subtraction

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1. Counting Objects by Groups:
   by 1s, 2s, 5s, 10s.
   Students count collections of objects in a variety of
2. Counting By 10s:
   modified for 3-digit numbers later in the year.
   Students count by tens from any given 2-digit number.
3. Solving Story Problems:
   apply the skill of counting by tens to solve story problems.
4. The Game of Tens and Ones:
   Tens and Ones
   Students use ten frames and play The Game of.
5. Story Problems and Centers:
   play games related to addition and subtraction.
   Students work in centers to solve story problems.
6. The Open Number Line:
   number to solve addition and subtraction word problems. The open number line is
   introduced as a strategy for solving the problems.
7. Solving Problems on the Open Number Line:
   strategies for solving a compare difference unknown situation. Students then solve
   2-3 problems independently using an open number line.
8. Building Two- and Three-Digit Numbers with Arrow Cards:
   to develop place value understanding. Place value games are played during this lesson.
9. Centers with Arrow Cards:
   Games played are Arrow Card Spin, Make the Largest Number and
   Get to 20. Students work in centers.
   Students continue to work on 2-digit and 3-digit place.
10. Two-step Problems:
    Students begin solving two-step problems with 2- and 3-digit.
11. Centers with Story Problems:
    Students solve Story Problems with 2- and 3-digit.
12. Write an Equation to Match the Story:
    They use this strategy to solve story problems. Strategies
    for solving the problems are discussed in class.
13. Find the Difference:
    Strategies are discussed.
    Students play “Greatest Difference Wins” to practice
14. Greatest Difference Wins:
    Students play the game The Greatest Difference Wins
    and work in centers.