What is 20 percent of 21?

Answer: 20 percent of 21 is 4.2. Alternatively, we can say that 4.2 is equivalent to 20% of 21.

Solution for What is 20 percent of 21:

n = 20 percent of 21 n = 20 % 21 n = 20 100 21 n = 20 21 100 n = 420 100 n = 4.2

Now we have 20% of 21 = 4.2. Alternatively, we can express it as 20 percent of 21 equals 4.2.


The step-by-step process for finding what is 20 percent of 21:

The mathematical calculation of 20% of 21 can be broken down as follows:

  • 20 percent * 21
  • Convert this into an equation: (20 / 100) * 21
  • Simplify the equation further: (20 * 21) / 100
  • Carry out the calculation: 420 / 100
  • The final answer is: 4.2

Thus, we conclude that 20% of 21 is 4.2.


Explanation for What is 20% of 21:

Step 1: 20 percent * 21

Think of percent as parts out of 100. So, when we say 20 percent, it's like having 20 parts out of a total of 100. What we want to do now is find out what those 20 parts would be if our total was 21 instead of 100.

Step 2: (20 / 100) * 21

This is like dividing our 20 parts into 100. It's as if we have 100 pieces of candy and we only want 20 of those pieces. That gives us 0.20 or 20 hundredths. Now we multiply those 20 parts (or 0.20) by 21 to find out what 20% of 21 would be.

Step 3: (20 * 21) / 100

This is an alternative calculation. Instead of doing it in two steps like we did before, we can also do it in one step. First, we multiply 20 (our 20 parts) by 21 (our total amount), and then we divide that by 100.

Step 4: 420 / 100

The previous step gave us 420. But remember we were pretending our total was 100? Now we have to divide by 100 to get back to the number for our real total, which is 21. That's why we divide 420 by 100.

Step 5: 4.2

Finally, after dividing 420 by 100, we arrive at the answer: 4.2. Hence, we can definitively say that 20% of 21 equals 4.2.

This guide aims to simplify the understanding of percentage calculations, focusing on the question "What is 20% of 21?" Keep practicing with different numbers to hone your skills in percentage calculations. We hope this helps you in your quest for better mathematical understanding.


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