Fact Family Worksheets - Math-Drills These fact family worksheets should help make those relationships very clear to students and perhaps help them to understand division a little better. The number 1 as a factor is only used in the fact families to 49 and 64 worksheets. After that, the factors include only 2 and up. For example, in the fact families to 100 worksheets, the factors will fall in a range of 2 to 10.