Calculating five times the number -9

To calculate five times the number -9, you use multiplication, specifically multiplying -9 by 5. Multiplication here means you are taking the value of -9 and combining it five times, which scales the number up proportionally. Think of it as adding -9 five separate times: -9 + -9 + -9 + -9 + -9. Performing the operation -9 * 5 accomplishes this in a single step. The expression -45 captures this calculation, so when you substitute any value for -9, evaluating -9 * 5 will give you five times that original number.