Basic Math Examples

Evaluate 4.50*12
4.5124.512
Step 1
Multiply using long multiplication.
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Step 1.1
Multiply 22 by 00. Place the result in the next column in the result line. There is one result line for each digit in 1212.
44.5500
×1122
00
Step 1.2
Multiply 22 by 55. Place the ones digit (0)(0) in the result line and carry the tens digit (1)(1). There is one result line for each digit in 1212.
11
44.5500
×1122
0000
Step 1.3
Multiply 22 by 44 and add the carried 11. Place the result in the next column in the result line. There is one result line for each digit in 1212.
44.5500
×1122
990000
Step 1.4
Multiply 11 by 00. Place the result in the next column in the result line. There is one result line for each digit in 1212.
44.5500
×1122
990000
0
Step 1.5
Multiply 1 by 5. Place the result in the next column in the result line. There is one result line for each digit in 12.
4.50
12
900
50
Step 1.6
Multiply 1 by 4. Place the result in the next column in the result line. There is one result line for each digit in 12.
4.50
12
900
450
Step 1.7
Add the numbers in each column. In this case, add 0+0, then place the 0 in the result line.
4.50
12
900
450
0
Step 1.8
Add the numbers in each column. In this case, add 0+0, then place the 0 in the result line.
4.50
12
900
450
00
Step 1.9
Add the numbers in each column. In this case, add 9+5, then place the 4 in the result line and carry the 1.
4.50
12
900
450
400
Step 1.10
Add the numbers in each column. In this case, add 0+4+1, then place the 5 in the result line.
4.50
12
900
450
5400
4.50
12
900
450
5400
Step 2
To find the number of decimal places needed in the answer, add the number of decimal places in the multiplier and multiplicand. In this case, there is a total of 2, so the answer must have 2 decimal places as well.
54
 [x2  12  π  xdx ]