Fact families are sets of three numbers that can be added and subtracted, or divided, and multiply together to show the relation between does numbers.
Here is a nice site to help with this basic skill.
http://www.sadlier-oxford.com/math/enrichment/gr1/ch6/0106b.htm
Here is a nice site to help with this basic skill.
http://www.sadlier-oxford.com/math/enrichment/gr1/ch6/0106b.htm