Quick qualities

Quality on a roll under system can be done a lot of ways. The obvious is to deduct the lower of the roll and the target.
Need 15? Roll a 9. Won by 6.
Need a 32? Roll a 51. Win by 19.
But this is a maths step, the less of these the better in my opinion.

Another method is to just take the tens into account. Need 63, rolled a 32- 6-3=3, or 30 if your talking in tens.
This is a much easier on the fly calculation, but there are a couple of other options.

On a success, you get the face value of the dice. Lets say you have 45% to hit. Rolling 00 to 45 on the dice gives you the same range as 45-result. It is instant.
But of course it only works on successes.
For fails, the face value system can work using this trick since only the DM needs judge a fail. Get the player to announce the face value, then take the tens digit from ten. "64- fail." would be (10-6=4) or fail by 40.
This takes all maths out for the player, they just roll and announce the face value and if it is a hit or not.

I personally feel a 1-10 scale for quality or 'Marks Out of Ten' is more practical than a 1-100 scale, as its hard to visualize such granularity.

However, the double digit system (11,22,33,44,55 etc) also gives an equally easy to visualize quality.
Exact pass. Pass. Double pass.
Fail by 1. Fail. Double fail. Natural 100.

Ep. Close shave.
P. Sound hit.
Dp. Great hit.
F1. Close (but no cigar)
F. Minor failure.
DF. Bad failure.
100. Critical fail.

If you only need quality for damage, that only happens on a hit. Thus face value of tens digit is perfect- so long as zero counts as 1 hit or has a positive result of some form.