Factors and Multiples

Problem a. Let's find the factors of twelve. One row of twelve. One times twelve is twelve. Two rows of six. Two times six is twelve. Three rows of four. Three times four is twelve.

The factors of twelve are one two three four six and twelve. Twelve is a composite number. Problem b. Let's find the factors of eight. One row of eight. One times eight is eight.

Two rows of four. Two times four is eight. The factors of eight are one two four and eight. Eight is a composite number. Problem c. Let's find the factors of fifteen.

One row of fifteen. One times fifteen is fifteen. Three rows of five. Three times five is fifteen. The factors of fifteen are one three five and fifteen. Fifteen is a composite number. Problem d.

Let's find the factors of seven. One row of seven. One times seven is seven. Seven only has one factor pair. The factors of seven are one and seven. Seven is a prime number. Problem e.

Let's find the factors of eighteen. One row of eighteen. One times eighteen is eighteen. Two rows of nine. Two times nine is eighteen. Three rows of six. Three times six is eighteen.

The factors of eighteen are one two three six nine and eighteen. Eighteen is a composite number. Problem f. Let's find the factors of eleven. One row of eleven. One times eleven is eleven.

Eleven only has one factor pair. The factors of eleven are one and eleven. Eleven is a prime number.