How to calculate 99 multiplied by 81 using long multiplication

How to calculate 99 multiplied by 81

How to calculate 99 multiplied by 81 using long multiplication. Here is step-by-step how to calculate 99 times 81 using long multiplication:

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

	9	9
x	8	1

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

	0
	9	9
x	8	1
		9

Step 3: Multiply
1 x 9 = 9. Take 9 and add 0 from the previous step to get 9. Enter 9 at the bottom:

	9	9
x	8	1
	9	9

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

	9	9
x	8	1
	9	9
+		0

Step 5: Multiply
8 x 9 = 72. Put 2 below the line and 7 as a reminder on top:

	7
	9	9
x	8	1
	9	9
+	2	0

Step 6: Multiply
8 x 9 = 72. Take 72 and add 7 from the previous step to get 79. Enter 79 at the bottom:

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

Step 7: Add to get answer
Add up the bottom two numbers (99 + 7920 = 8019) to get the answer:

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

The bottom line is the answer. Therefore, 99 times 81 equals:

8019

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