How Find Ratio of Number

A ratio may be written as A:B or A/B or by the phrase "A to B".

A ratio of 1:5 says that the second number is five times as large as the first.

The following steps will allow determination of a number when one number and the ratio between the numbers is given.

Example: Determine the value of B if A=6 and the ratio of A:B = 2:5

• Determine how many times the number A is divisible by the corresponding portion of the ratio. (6/2=3)
• Multiply this number by the portion of the ratio representing B (3*5=15)
• Therefore if the ratio of A:B is 2:5 and A=6 then B=15

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trick to calculate percent of any number

this trcik will use full to you calculate percent of any number in your exam

To determine the percent of a number do the following steps:

• Multiply the number by the percent (e.g. 87 * 68 = 5916)
• Divide the answer by 100 (Move decimal point two places to the left) (e.g. 5916/100 = 59.16)
• Round to the desired precision (e.g. 59.16 rounded to the nearest whole number = 59)

if you want calculate 3% of 100 then 

=> 100*3=300

=> 300/100=3 

so that 3% of 100 is 3 

think this will use full to you 

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