When someone asks you **51** is what percentage of **21** they want to know the ratio of **51** to **21** expressed as a fraction of **100**. In this guide, I will show you, step by step, how you can find **51** is what percentage of what. Percentage is one of the most critical topics in mathematics. We use it in our everyday activities such as calculating interest rates, profits, losses, and represents many forms of statistics. In this article, I will guide you step by step on how to calculate** 51** is what percentage of **21.**

If you are in a rush **51** is **243%** of **21**

**How to calculate 51 is what percentage of 21**

You can calculate **51** is percentage of **21** quickly by doing a quick search on Google or by asking Siri. However, it’s more helpful to know how to calculate it on your own. For example, you want to buy a product online that costs **21** amount and want to leave a down payment of **51**** **amount. Then you might want to know what percentage of the deposit you are making. This will help you have a clear picture of your payment progress.

Follow these simple steps.

**Step 1:** Percentage is a ratio that is expressed as a fraction. Therefore, when asked **51** is what Percentage of **21**** **this is how you should express the problem

**51/21**

**Step 2: **Divide **51**** **by **21**

**2.428571429**

**Step 3: **After dividing you need to multiply the answer by **100 **to convert it into percentage

**2.428571429 ****×**** 100**

Therefore **51** is **243%** of **21**

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