Percentage to decimal 
Decimal to percentage 
5% to 0.05
 Simple swaps here.
 Remove the % at the end
 If <10 swap it for '0.0' at the start else swap it for '0.'
2.5% to 0.025
 Remove the % at the end
 If <10 swap it for '0.0' at the start else swap it for '0.'
 Drop the second decimal point

1/10 to 10%
 This is simpler.
 Multiply by 100 and add the % sign
1/25 to 4%
 Multiply by 100 (100 x 1/25 = 100/25)
 Add the % sign

Decimal to fraction 
Fraction to decimal 
0.025 to 25/1000
 Look for the rightmost figure to find whether it’s tenths, hundredths or thousandths.
 Here 5 is in the 3rd column after the decimal point so we’ve got thousandths.
 25 of them in fact.
0.1 to 1/10
 Here 1 is in the 1st column after the decimal point so we have tenths.
 Just one of them (1/10).

25/1000 to 0.025
 Divide the top (25) by the bottom (1000)
 Here dividing by 1000 is equivalent to moving the decimal point 3 places to the left.
1/10 to 0.1
 Divide the top (1) by the bottom (10)
 Here dividing by 10 is equivalent to moving the decimal point 1 place to the left.

Fraction to percentage 
Percentage to fraction 
1/10 to 10%
 This is simpler.
 Multiply by 100 and add the % sign
1/25 to 4%
 Multiply by 100 (100 x 1/25 = 100/25)
 Add the % sign

10% to 1/10
 Drop the % sign (10)
 Divide by 100. (10/100)
 Rationalise (1/10)
4% to 1/25
 Drop the % sign (4)
 Divide by 100. (4/100)
 Rationalise (1/25)

What's your opinion?
Average rating
Not yet rated