1.1. Number & place value
1.1.1. Mixed operations
1.1.2. Counting Up to 99
1.1.3. Counting Up to 999
1.1.4. Skip Counting
1.1.5. Numerals and Number Names
1.1.6. Number lines
1.1.8. Place Values and Face Values
1.1.9. Roman Numerals I, IV, X, L
1.1.10. Even and Odd
1.1.11. Addition
1.1.12. Subtraction
1.1.12.1. Subtract Two One-Digit Numbers
1.1.12.3. Subtraction of Two Numbers
1.1.12.4. Forming Numbers Using Subtraction
1.1.12.4.1. Balancing Subtraction Sentences
1.1.12.4.2. Related Subtraction Facts
1.1.12.4.3. Subtract Multiples of 10
1.1.12.4.4. Subtraction Word Problems
1.1.12.5. Write subtraction number sentence
1.1.14. Multiplication
1.1.15. Division
1.4. Patterns and algebra