Calculating five times the number 51

To calculate five times the number 51, you use multiplication, specifically multiplying 51 by 5. Multiplication here means you are taking the value of 51 and combining it five times, which scales the number up proportionally. Think of it as adding 51 five separate times: 51 + 51 + 51 + 51 + 51. Performing the operation 51 * 5 accomplishes this in a single step. The expression 255 captures this calculation, so when you substitute any value for 51, evaluating 51 * 5 will give you five times that original number.