Basic Addition Introduction to addition. Multiple visual ways to represent addition.
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Lec 8 - Subtraction 3: Introduction to Borrowing or Regrouping
Lec 9 - Alternate mental subtraction method
Lec 13 - Adding Decimals (Old)
Lec 14 - Subtracting decimals (old)
Lec 16 - Multiplication 2: The Multiplication Tables
Lec 17 - Multiplication 3: 10,11,12 times tables
Lec 18 - Multiplication 4: 2-digit times 1-digit number
Lec 19 - Multiplication 5: 2-digit times a 2-digit number
Lec 20 - Multiplication 6: Multiple Digit Numbers
Lec 21 - Multiplication 7: Old video giving more examples
Lec 22 - Mulitplication 8: Multiplying decimals (Old video)
Lec 23 - Lattice Multiplication
Lec 24 - Why Lattice Multiplication Works
Lec 27 - Division 3: More long division and remainder examples
Lec 29 - Converting fractions to decimals
Lec 32 - Ordering Numeric Expressions
Lec 33 - Greatest Common Divisor
Lec 34 - Least Common Multiple
Lec 36 - Mixed numbers and improper fractions
Lec 38 - Time Differences in Different Time Zones