Calculating five times the number 90

To calculate five times the number 90, you use multiplication, specifically multiplying 90 by 5. Multiplication here means you are taking the value of 90 and combining it five times, which scales the number up proportionally. Think of it as adding 90 five separate times: 90 + 90 + 90 + 90 + 90. Performing the operation 90 * 5 accomplishes this in a single step. The expression 450 captures this calculation, so when you substitute any value for 90, evaluating 90 * 5 will give you five times that original number.