You are wondering how you would be able to subtract better and do not worry because there are various tips that you should know. One thing to remember, you have learned in school that you need to subtract from right to left but if you are subtracting with the use of your mind, you may need to subtract from left to right.
This means that you have to start from the biggest numbers until you get to the smaller ones. This will make it easier because you can focus on the small details after and just focus on what matters first. You should also practice subtracting more with the use of your mind. You will see yourself start to improve after.