In our last lesson we worked with the "natural" numbers (1, 2, 3....). Over time, for several reasons, people found a need to move beyond the natural numbers and create the integers. A natural number without a dash in front meant something “positive” (I have 6 sheep to sell), while the same number preceded by a dash meant something “negative” (when the ship sank I lost 6 sheep that I could have sold). After this video you'll be able to multiply and divide integers. This material is covered on pages 13-18 in our text.
Multiplying and dividing integers