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R4 Finding 25% and 75%
Contributed by: Cason

25% = 1/4

75% = 3/4

 

To find 25% we can multiply by 0.25, multiply by 1/4,

or divide by 4 as all will give us the same answer.

 

25% of 40 is 10

40 x ¼ = 10

40 ÷ 4 = 10

 So to find 25% of any number just divide by 4. 
25% of 16 =16 x ¼ = 16 ÷ 4 =

25% + 25% + 25% + 25% = 100% = 1.

That is why 25% = 1/4.  Instead of multiplying by 1/4,

we can divide by its reciprocal which is 4.

25% of 200 =
25% of 32 =
25% of 100 =
25% of 20 =
25% of 80 =
25% of 64 =
25% of 72 =
25% of 90 =

0.25 equals 25% which equals 1/4 which also equals the

reciprocal of 1/4.  So we can divide by 4 instead of

multiplying by 0.25

100 x .25 =

0.25 equals 25% which equals 1/4 which also equals the

reciprocal of 1/4.  So we can divide by 4 instead of

multiplying by 0.25

60 x .25 =
400 x .25 =

0.25 equals 25% which equals 1/4 which also equals the

reciprocal of 1/4.  So we can divide by 4 instead of

multiplying by 0.25

56 x .25 =
12 x .25 =
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75%  of 80 = 25% of 80 x 3.

 

25% of 80 is 20.  20 x 3 = 60.

75% of 80 =
25% + 25%
25% + 25%  + 25%
20
25%
20
20
20
= 80
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 16
75% of 16 =
25% + 25%
25% + 25%  + 25%

   4

25%

 4

 4

4

= 16
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 20
75% of 20 =
25% + 25%
25% + 25%  + 25%

   5

25%

 5

 5

5

= 20
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 400
75% of 400 =
25% + 25%
25% + 25%  + 25%

  100

25%

100

100

100

= 400
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 40
75% of 40 =
25% + 25%
25% + 25%  + 25%

  10

25%

10

10

10

= 40
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 48 =

 12

 12

12

12

= 48
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 60 =
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 64 =
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 10 =
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 12 =
25% x 3 = 75%

So to find 75%, find 25% first and then triple.

75% of 9 =
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