How to calculate 90 multiplied by 45 using long multiplication

How to calculate 90 multiplied by 45

How to calculate 90 multiplied by 45 using long multiplication. Here is step-by-step how to calculate 90 times 45 using long multiplication:

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

	9	0
x	4	5

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

	0
	9	0
x	4	5
		0

Step 3: Multiply
5 x 9 = 45. Take 45 and add 0 from the previous step to get 45. Enter 45 at the bottom:

		9	0
x		4	5
	4	5	0

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

		9	0
x		4	5
	4	5	0
+			0

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

		0
		9	0
x		4	5
	4	5	0
+		0	0

Step 6: Multiply
4 x 9 = 36. Take 36 and add 0 from the previous step to get 36. Enter 36 at the bottom:

			9	0
x			4	5
		4	5	0
+	3	6	0	0

Step 7: Add to get answer
Add up the bottom two numbers (450 + 3600 = 4050) to get the answer:

			9	0
x			4	5
		4	5	0
+	3	6	0	0
=	4	0	5	0

The bottom line is the answer. Therefore, 90 times 45 equals:

4050

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

How to calculate 91 multiplied by 45
Here is the next multiplication problem in our math book that we solved with long multiplication.