These forms feature a grid for determining the factors of numbers from 1 to 100. Factors are the numbers that can be multiplied together to get another number. So, for example, the factors of the number 21 are 7 and 3. The forms have the numbers 1 through 100 in two columns with five additional spaces to the right of each number for recording the factors. The forms measure 41 cm x 23 cm (about 16" x 9"), are printed on both sides and come in a pack of thirty.