you get the same number that you were multiplying,
for example, 9x1=9, 3x1=3, 1098712809602879346 x 1 =1098712809602879346
When you multiply a number by 1, it stays the same. When you multiply a number by a number greater than 1, it increases. When you multiply a number by a number that is less than 1 (a proper fraction), it decreases.
You can multiply 1: by 63.
600
That would be the number 1.
To increase a number by a certain percent, multiply it by (1 + n/100). For example, to increase a number by 15 percent, multiply it by (1 + 15/100), or 1.15. To decrease a number by 15 percent, multiply it by (1 - 15/100), or 0.85.