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.
01:39
Addition of Whole Numbers, Part I: 100 Addition Facts, The
This clip explains that there are 100 addition facts that should be learned so that they become as automatic as knowing that the letter "b" comes after the letter "a" in the alphabet.