Basic Math Examples

Evaluate 0.80*50
0.8500.850
Step 1
Multiply using long multiplication.
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Step 1.1
Multiply 00 by 00. Place the result in the next column in the result line. There is one result line for each digit in 5050.
00.8800
×5500
00
Step 1.2
Multiply 00 by 88. Place the result in the next column in the result line. There is one result line for each digit in 5050.
00.8800
×5500
0000
Step 1.3
Multiply 00 by 00. Place the result in the next column in the result line. There is one result line for each digit in 5050.
00.8800
×5500
000000
Step 1.4
Multiply 55 by 00. Place the result in the next column in the result line. There is one result line for each digit in 5050.
00.8800
×5500
000000
00
Step 1.5
Multiply 55 by 88. Place the ones digit (0)(0) in the result line and carry the tens digit (4)(4). There is one result line for each digit in 5050.
44
00.8800
×5500
000000
0000
Step 1.6
Multiply 55 by 00 and add the carried 44. Place the result in the next column in the result line. There is one result line for each digit in 5050.
00.8800
×5500
000000
440000
Step 1.7
Add the numbers in each column. In this case, add 0+00+0, then place the 00 in the result line.
00.8800
×5500
000000
440000
00
Step 1.8
Add the numbers in each column. In this case, add 0+00+0, then place the 00 in the result line.
00.8800
×5500
000000
440000
0000
Step 1.9
Add the numbers in each column. In this case, add 0+00+0, then place the 00 in the result line.
00.8800
×5500
000000
440000
000000
Step 1.10
Add the numbers in each column. In this case, add 0+40+4, then place the 44 in the result line.
00.8800
×5500
000000
440000
44000000
00.8800
×5500
000000
440000
44000000
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 22, so the answer must have 22 decimal places as well.
4040
 [x2  12  π  xdx ]  x2  12  π  xdx