Calculating five times the number 20

To calculate five times the number 20, you use multiplication, specifically multiplying 20 by 5. Multiplication here means you are taking the value of 20 and combining it five times, which scales the number up proportionally. Think of it as adding 20 five separate times: 20 + 20 + 20 + 20 + 20. Performing the operation 20 * 5 accomplishes this in a single step. The expression 100 captures this calculation, so when you substitute any value for 20, evaluating 20 * 5 will give you five times that original number.