How to calculate 81 multiplied by 45 using long multiplication

How to calculate 81 multiplied by 45

How to calculate 81 multiplied by 45 using long multiplication. Here is step-by-step how to calculate 81 times 45 using long multiplication:

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

	8	1
x	4	5

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

	0
	8	1
x	4	5
		5

Step 3: Multiply
5 x 8 = 40. Take 40 and add 0 from the previous step to get 40. Enter 40 at the bottom:

		8	1
x		4	5
	4	0	5

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

		8	1
x		4	5
	4	0	5
+			0

Step 5: Multiply
4 x 1 = 4. Put 4 below the line and 0 as a reminder on top:

		0
		8	1
x		4	5
	4	0	5
+		4	0

Step 6: Multiply
4 x 8 = 32. Take 32 and add 0 from the previous step to get 32. Enter 32 at the bottom:

			8	1
x			4	5
		4	0	5
+	3	2	4	0

Step 7: Add to get answer
Add up the bottom two numbers (405 + 3240 = 3645) to get the answer:

			8	1
x			4	5
		4	0	5
+	3	2	4	0
=	3	6	4	5

The bottom line is the answer. Therefore, 81 times 45 equals:

3645

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How to calculate 82 multiplied by 45
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