Art of Problem Solving
Why Do People Say that Repeated Addition is Multiplication?
Is a repeated addition definition mathematically valid? Using mathematical properties, a video explains why, even though there is a connection between repeated addition and multiplication, it is not a good definition. The properties hold...
Curated OER
Multiplication
A truly adorable video. Matthew, an upper grader, teaches little ones how to multiply. He shows multiplication as repeated addition, and explains what happens when you multiply a number by 1 and by 0. His explanations are clear and his...
Curated OER
Multiplication Tables
An instructor shows that with multiplication it is easier to multiply than to solve a problem through repeated addition. This is a very concrete example that shows both the reason and the rational behind multiplication.