Multiplying 2 2-digit numbers with the sum of the tens digits equal to 10, and the units digits are identical.
Example 1. 76 x 36
Method
Step 1. The last digits of the answer are the product of units digits, that is, 6 x 6 = 36
Step 2. Add the units digit to the product of the tens digits, that is, 7 x 3 + 6 = 21 + 6 = 27
Step 3. Place the answer in 2 in front of answer in 1, the final answer is 2736
Example 2. 93 x 13
Method
Step 1. 3 x 3 = 09
Step 2. 9 x 1 + 3 = 9 + 3 = 12
Step 3. 1209
