Vedic / Quicker / Shortcut Math ⇒ Topic : Multiply any 2 digit number by 15

Samual
 
Another amazing way to multiply a 2 digit number by 15. I especially love to use this trick when the given number is easily divisible by 2.
Lets now go through the steps
Step 1: Find half of the given number.
Step 2:Now add the given number and the result obtained in step 1.
Step 3:Multiply the result obtained in step 2 by 10.
Now let us consider a few examples to understand better Example 1: 12 x 15 = ?
Step 1:We find that half of the number is
12 /2 = 6 Step 2: Adding the given number and the result obtained in step 1 we get 12 + 6 = 18 Step 3:Multiplying the result obtained in step 2 by 10 we get 180 Ans 12 x 15 = 180 Example 2:48 x 15 = ?
Step 1:We find that half of the number is
48 /2 = 24 Step 2: Adding the given number and the result obtained in step 1 we get 48 + 24 = 72 Step 3:Placing zero next to step 2 we get 720 Ans 48 x 15 = 720 Now you try applying this trick to multiply 25, 72 ,43,57 by 15 in secs  
 
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