Which is a correct way to add 99 to a number? Add 100. Then subtract 1. Subtract 100. Then subtract 1. Add 100. Then add 1. Add 100. Then subtract 10

The correct way to add 99 to a number is: Add 100. Then subtract 1.

Explanation: If you add 100 to a number, you increase it by 100. Then, by subtracting 1, you effectively decrease the result by 1, which gives you the same result as adding 99. For example, if you start with the number 5:

1. Add 100: 5 + 100 = 105
2. Subtract 1: 105 – 1 = 104

So, 5 + 99 = 104, which is the same as adding 100 and then subtracting 1.