Finding triple of 21 quickly

To find the triple of 21, the key step is to multiply 21 by 3. Tripling a number means you combine three copies of the number together, which multiplication simplifies into one operation. So, instead of adding 21 three times, you multiply it by 3. By performing the calculation 21 * 3, you directly obtain 63, which represents the triple of 21. This straightforward approach ensures you can quickly and accurately calculate the triple for any number 21 without additional steps or complications. Understanding how multiplication works as repeated addition helps clarify why this method efficiently gives the desired triple value.