How to calculate 21 multiplied by 21 using long multiplication

How to calculate 21 multiplied by 21

How to calculate 21 multiplied by 21 using long multiplication. Here is step-by-step how to calculate 21 times 21 using long multiplication:

Step 1: Setup
Set up your multiplication problem like this:

	2	1
x	2	1

Step 2: Multiply
1 x 1 = 1. Put 1 below the line and 0 as a reminder on top:

	0
	2	1
x	2	1
		1

Step 3: Multiply
1 x 2 = 2. Take 2 and add 0 from the previous step to get 2. Enter 2 at the bottom:

	2	1
x	2	1
	2	1

Step 4: Add 0
Enter a 0 at the bottom right as a place holder, because you now move over one digit:

	2	1
x	2	1
	2	1
+		0

Step 5: Multiply
2 x 1 = 2. Put 2 below the line and 0 as a reminder on top:

	0
	2	1
x	2	1
	2	1
+	2	0

Step 6: Multiply
2 x 2 = 4. Take 4 and add 0 from the previous step to get 4. Enter 4 at the bottom:

		2	1
x		2	1
		2	1
+	4	2	0

Step 7: Add to get answer
Add up the bottom two numbers (21 + 420 = 441) to get the answer:

		2	1
x		2	1
		2	1
+	4	2	0
=	4	4	1

The bottom line is the answer. Therefore, 21 times 21 equals:

441

Long Multiplication Calculator
Please enter another multiplication problem for us to explain and solve:

How to calculate 22 multiplied by 21
Here is the next multiplication problem in our math book that we solved with long multiplication.