An array is a rectangle arranged into equal rows. We learned that an array is one form of multiplication. For example, if I have 3 rows with 5 squares in each row, I have a multiplication problem. I can find out how many squares in all by multiplying 3 x 5. (You probably learned this as finding the area. We will make that connection in a couple of months.)
Today we discussed that the dimensions of the rectangle are also the factors. Thinking about the previous example, 3 x 5 are the dimensions of the rectangle, and also factors of fifteen.
This morning we began to practice identifying factors of a number. I challenged third grade mathematicians to find the factors in pairs. For example, if I am finding the factors of 18, I know I should start with 1 because 1 is a factor of every number. I will automatically identify 18 next because 1 x 18 = 18. Next, I will list 2 as a factor because 18 is an even number, and I know that all even numbers are multiples of 2. I figure out what to multiply by 2 to get to 18, and realize that 9 is also a factor of 18. I continue in this way until my possibilities are exhausted.
Challenge your child to find the factors of 12 or 24 at home!
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