How to calculate 39 multiplied by 21 using long multiplication

How to calculate 39 multiplied by 21

How to calculate 39 multiplied by 21 using long multiplication. Here is step-by-step how to calculate 39 times 21 using long multiplication:

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

	3	9
x	2	1

Step 2: Multiply
9 x 1 = 9. Put 9 below the line and 0 as a reminder on top:

	0
	3	9
x	2	1
		9

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

	3	9
x	2	1
	3	9

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

	3	9
x	2	1
	3	9
+		0

Step 5: Multiply
2 x 9 = 18. Put 8 below the line and 1 as a reminder on top:

	1
	3	9
x	2	1
	3	9
+	8	0

Step 6: Multiply
2 x 3 = 6. Take 6 and add 1 from the previous step to get 7. Enter 7 at the bottom:

		3	9
x		2	1
		3	9
+	7	8	0

Step 7: Add to get answer
Add up the bottom two numbers (39 + 780 = 819) to get the answer:

		3	9
x		2	1
		3	9
+	7	8	0
=	8	1	9

The bottom line is the answer. Therefore, 39 times 21 equals:

819

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How to calculate 40 multiplied by 21
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