Example  1 : 86 – 68

Step 1 : Take the bigger number and find the difference of the digits i.e. 8 – 6 = 2

Step 2 : Multiply the output of step 1 by 9 i.e. 9 * 2 = 18

Step 3 : 18 (It’s the final answer)

Please try :

1. 65 – 56
2. 76 – 67
3. 84 – 48