Quickly finding the quintuple of 18

To quickly find the quintuple of 18, you multiply 18 by 5. This operation means you are taking the original number 18 and increasing it fivefold. Multiplying by 5 is the same as adding 18 to itself five times, which simplifies the calculation and gives the total amount in just one step. When you calculate 90 by multiplying 18 by 5, you receive the quintuple of 18. This approach is efficient and applies to any number you choose for 18. For example, if 18 were 7, then 7 multiplied by 5 would give 90 as 35. This method allows you to quickly find five times any number using simple multiplication.