Step 1:- Put a zero on the right side of the number (Multiplicand).
Step 2:- Divide the number obtained in step 1 by 2.
Step 3:- Add both the numbers. This sum is your answer.
Example 1:- 42 × 15
Step 1:- 420 (Put a zero on the right side)
Step 2:- 420 / 2 = 210 (Divide by 2)
Step 3:- 420 + 210 = 630 (Add both the results)
Ans. 630
Example 2:- 2546 × 15
Step 1:- 25460
Step 2:- 25460 / 2 = 12730
Step 3:- 25460 + 12730 = 38190
Ans. 38190
HAPPY LEARNING…………………..