What do you multiply together to get 7

3.5 x 2 could be multiplied together to get 7

There are many answers depending of which types of numbers you can choose from.

Whole numbers: 1 * 7

Integers: 1 * 7, - 1 * (-7)

Rational numbers: Any two rational numbers whose product is 7 such as

3.5 * 2; 0.1 * 70, 14 * 0.5

Irrational numbers: any two rational numbers whose product is 7, such as sqrt (7) * sqrt (7).