four times the number
The number that is twenty-one times greater than four is eighty-four.
the product of 15 and a number by its self four times.
The number is 3
4
Four times a number x equals 4x.
4 times a number added to 7 times the number equals 33
4n-5 (Which is four times a number minus 5)
four times the product of negative three and a number
A number squared is just that number times itself. For example four squared is four times four equals sixteen (42 = 4 x 4 = 16).
The four in the second number is ten times the four on the left of the first number and one hundred thousand times the four on the right.
It is impossible to tell without knowing what the number being multiplied by four is.