Basic Calculation:14

Multiplication of a number by 25

Detailed Explanation: Multiplication of a number by 25 is a very interesting. If any number is a multiple of 4; then the number is how many times of 4. That number of times is the number of hundreds.

For example, in the multiplication of 12 by 25; 12 is 3 times of 4; so the answer is 300

Similarly, 36 is 9 times of 4, so 36 × 25 = 900

The logic is that four times of 25 is one hundred.

36 × 25 =  9 × (4 × 25) = 9 × 100 = 900

48 × 25 =  12 × (4 × 25) = 12 × 100 = 1200

64 × 25 =  16 × (4 × 25) = 16 × 100 = 1600 and so on.

If the number is not a multiple of 4, then we make it as a multiple of 4 nearest to the number and add the extra “25” at the end.

For example, 13 × 25 = 12 × 25 + 1 × 25 = 3 × (4 × 25) + 25 = 3 × 100 + 25 = 325. Ans.

27 × 25 = 24 × 25 + 3 × 25 = 6 × (4 × 25) + 75 = 6 × 100 + 75 = 675. Ans.

Now

12 × 25 =  3 × 100 =  300

36 × 25 =  9 × 100 =  900

48 × 25 = 12 × 100 = 1200

56 × 25 = 14 × 100 = 1400

84 × 25 = 21 × 100 = 2100

64 × 25 = 16 × 100 = 1600

96 × 25 = 24 × 100 = 2400

112 × 25 = 28 × 100 = 2800

124 × 25 = 31 × 100 = 3100

148 × 25 = 37 × 100 = 3700

13 × 25 = 12 × 25 + 1 × 25 = 325

27 × 25 = 24 × 25 + 3 × 25 = 675

33 × 25 = 32 × 25 + 1 × 25 = 825

62 × 25 = 60 × 25 + 2 × 25 = 1550

85 × 25 = 84 × 25 + 1 × 25 = 2125

13 × 25 =12 × 25 + 1 × 25 = 325

13 × 25 =12 × 25 + 1 × 25 = 325