Basic Calculation:15:

Multiplication of a number by 125

16 × 125 = 2 × 1000 = 2000

24 × 125 = 3 × 1000 = 3000

64 × 125 = 8 × 1000 = 8000

48 × 125 = 6 × 1000 = 6000

72 × 125 = 9 × 1000 = 9000

88 × 125 = 11 × 1000 = 11000

104 × 125 = 13 × 1000 = 13000

128 × 125 = 16 × 1000 = 16000

112 × 125 = 14 × 1000 = 14000

152 × 125 = 19 × 1000 = 19000

17 × 125 = 16 × 125 + 1 × 125 = 2125

26 × 125 = 24 × 125 + 2 × 125 = 3250

43 × 125 = 40 × 125 + 3 × 125 = 5375

65 × 125 = 64 × 125 + 1 × 125 = 8125

97 × 125 = 96 × 125 + 1 × 125 = 12125

114 × 125 = 112 × 125 + 2 × 125 = 14250

129 × 125 = 128 × 125 + 1 × 125 = 16125

153 × 125 = 152 × 125 + 1 × 125 = 19125

124 × 125 = 120 × 125 + 4 × 125 = 15500

133 × 125 = 128 × 125 + 5 × 125 = 16625

Detailed Explanation: Multiplication of a number by 125 is also very interesting. If any number is a multiple of 8; then the number is how many times of 8. That number of times is the number of thousands.

For example, in the multiplication of 16 by 125; 16 is 2 times of 8; so the answer is 2000

Similarly, 24 is 3 times of 8, so 24 × 125 = 3000

The logic is that eight times of 125 is one thousand.

64 × 125 = 8 × (8 × 125) = 8 × 1000 = 8000

48 × 125 = 6 × (8 × 125) = 6 × 1000 = 6000

72 × 125 = 9 × (8 × 125) = 9 × 1000 = 9000 and so on.

If the number is not a multiple of 8, then we make it as a multiple of 8 nearest to the number (to be multiplied) and add the extra “125’s” at the end.

For example,

17 × 125 = 16 × 125 + 1 × 125 = 2 × (8 × 125) + 125 = 2 × 1000 + 125 = 2125. Ans.

26 × 125 = 24 × 125 + 2 × 125 = 3 × (8 × 125) + 250 = 3 × 1000 + 250 = 3250. Ans.

43 × 125 = 40 × 125 + 3 × 125 = 5 × (8 × 125) + 375 = 5 × 1000 + 375 = 5375. Ans.

And, so on.