How to calculate 80 multiplied by 21 using long multiplication

How to calculate 80 multiplied by 21

How to calculate 80 multiplied by 21 using long multiplication. Here is step-by-step how to calculate 80 times 21 using long multiplication:

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

	8	0
x	2	1

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

	0
	8	0
x	2	1
		0

Step 3: Multiply
1 x 8 = 8. Take 8 and add 0 from the previous step to get 8. Enter 8 at the bottom:

	8	0
x	2	1
	8	0

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

	8	0
x	2	1
	8	0
+		0

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

	0
	8	0
x	2	1
	8	0
+	0	0

Step 6: Multiply
2 x 8 = 16. Take 16 and add 0 from the previous step to get 16. Enter 16 at the bottom:

			8	0
x			2	1
			8	0
+	1	6	0	0

Step 7: Add to get answer
Add up the bottom two numbers (80 + 1600 = 1680) to get the answer:

			8	0
x			2	1
			8	0
+	1	6	0	0
=	1	6	8	0

The bottom line is the answer. Therefore, 80 times 21 equals:

1680

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How to calculate 81 multiplied by 21
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