00:47
Multiplying Whole Numbers, Part 1: Identity For Multiplication, The
This clip explains that, just as zero is the identity for addition, the number 1 is the identity for multiplication because, any number, when multiplied by 1, "...isn't changed at all."
03:48
Addition of Whole Numbers, Part I: Addition Tricks and Hints
This clip presents a variety of hints and tricks that make learning the 100 addition facts simple and automatic. Among these are the identity for addition, and re-grouping addends in the easiest possible order.
00:43
Addition of Whole Numbers, Part I: Summary: Addition of Whole Numbers, Part One
This clip summarizes some of the main ideas that pertain to the addition of whole numbers, including the concept of combining smaller numbers, known as addends, to form a larger number, called the "sum," as well as learning the 100 addition facts so...