Section A: Units of Ten

Practice Problems

• Lesson 1 : Count Large Collections

• Lesson 2 : Match Representations of Tens

• Lesson 3 : Addition and Subtraction with Tens

• Lesson 4 : More Addition and Subtraction with Tens

• Lesson 5 : Center Day 1

Section B: Tens and Ones

Practice Problems

• Lesson 6 : Count Larger Collections

• Lesson 7 : Numbers With Tens and Ones

• Lesson 8 : Different Representations of Tens and Ones

• Lesson 9 : Show Me Your Number

• Lesson 10 : Write Two-digit Numbers

• Lesson 11 : Add Tens to Two-digit Numbers

• Lesson 12 : Mentally Add and Subtract Tens

• Lesson 13 : Center Day 2

Section C: Compare Numbers to 99

Practice Problems

• Lesson 14 : Let’s Compare

• Lesson 15 : Greater Than, Less Than

• Lesson 16 : Write Comparisons with Symbols

• Lesson 17 : Compare and Order Numbers

• Lesson 18 : Center Day 3

Section D: Different Ways to Make a Number

Practice Problems

• Lesson 19 : Make Two-digit Numbers

• Lesson 20 : Make Two-Digit Numbers in Different Ways

• Lesson 21 : Compare Two-Digit Numbers Shown in Different Ways

• Lesson 22 : Center Day 4

• Lesson 23 : Two-Digit Numbers in Our World