Lectures in Multiplication
Lecture 1: How To Quickly Check Your Multiplication
Lecture 2: How To Quickly Square A Number Ending In 5 In Your Head!
Lecture 3: How To Multiply 2 Numbers Quickly In Your Head!
Lecture 4: When Is A Number Divisible By 3?
Lecture 5: When Is A Number Divisible By 4?
Lecture 6: How To Multiple 2 2-Digit Number Quickly Without A Calculator