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Finding 5 percent of a number

Choose a large number


Move the decimal point one place to the left
.


Divide by 2 (take half of it).

 

Example

Find 5% of 750.

Solution

Move the decimal point one place to the left.: 75

 

Divide by 2: 75/2 = 37.50

 

So 5% of 750 = 37.50

Finding 2 1/2 percent of a number

Step-1: Choose a number
 
Step-2: Divide by 4 (or divide twice by 2). 
 
Step-3: Move the decimal point one place to the left. 
 
Example

Find 2 ½ %  of 66.

Solution
Divide 66 by 4: 66/4 = 16.5
 
Move the decimal point one place to the left. =1.65
 
So 2 1/2% of 66 = 1.65

Finding 15 percent of a number

Choose a 2-digit number.

Multiply the number by 3.

Divide by 2.

Move the decimal point one place to the left.
 
Example

Find 15 % of 53.

Solution
Multiply by 3 : 3 × 53 = 159
 
Divide by 2 : 159/2 = 79.5
 
Move the decimal point one place to the left: 7.95
 
So 15% of 43 = 7.95.

Finding 20 percent of a number

Choose a 2-digit number
 
Divide the number by 5
 
Example

Find 20% of 46.

Solution
Divide by 5: 46/5 = 9.2
 
So 20% of 46 = 9.2

Finding 25 percent of a number

Divide by 4.
 
Example

Find 25% of  86.

Solution
Divide 86 by 4: 86/4 = 21.5
 
So 25% of 86 = 21.5

Finding 75 percent of a number

Choose a number
 
Multiply the number by 3
 
Divide this product by 4
 
Example

Find 75 % of 63.

Solution
Multiply the number by 3: 3 × 63 = 180 + 9 = 189.
 
Divide this product by 4: 189/4 = 47.25.
 
So 75% of 63 = 47.25

Finding 60 percent of a number

Choose a 2-digit number. 
 
Multiply the number by 6. 
 
Move the decimal point one place to the left. 
 
Example

Find 60 % of 38.

Solution
Multiply by 6: 6 × 38 = 180 + 48 = 228.
 
Move the decimal point one place to the left: 22.8
 
So 60% of 38 = 22.8.

Finding 45 percent of a number

Choose a 2-digit number. 
 
Multiply the number by 9. 
 
Divide by 2. 
 
Move the decimal point one place to the left. 
 
Example

Find 45 % of 16.

Solution
Multiply by 9: 9 × 16 144
 
Divide by 2: 144/2 = 72
 
Move the decimal point one place to the left: 7.2
 
So 45% of 16 = 7.2




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