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Khan Academy Links
Base Ten
Understand Place Value, Counting, and Cardinality
- Add within 1000: Level 1
- Add within 1000: Level 2
- Adding and subtracting within 1000 using a number line
- Addition within 100
- Adding and subtracting using a number line
- Adding 10's and 100's (no regrouping)
- Adding two and three digit numbers (no regrouping)
- Breaking apart three-digit addition problems
- Adding two-digit numbers by making tens
- Adding two-digit numbers by making tens 2
- Regrouping: two-digit number minus one-digit number
- Select Strategies for adding within 100
- Subtracting 1s or 10s (no regrouping)
- Subtraction within 20
- Subtraction within 100
- Subtracting 10s and 100s (no regrouping)
- Subtracting two and three digit numbers (no regrouping)
- Subtracting 1 or 10
- Subtracting two-digit numbers (no regrouping)
- Subtract within 1000: Level 1
- Subtract within 1000: Level 2
Understand Place Value, Counting, and Cardinality