hehe It is quite complicated. There are 2 scores, the A score (difficulty value) and the B score (Execution value) Both are added together to get the final score.
For Level 2 C kids their routine will have an A score of 5.00 if they do the full routine with all the skills in the correct order. The score starts at 5.0 and may drop lower for skills left out. If the gymnast leaves out a core skill (ie forgets to do their jump on beam) they will lose 0.6 from their start value. If they attempt a core skill but it doesnt meet the minimum requirements (ie handstand does not reach with in 10 degree's of vertical on floor) they will lose 0.3 from their start value. If they perform only half of a core skill they will lose 0.3 and if they do the skills out of order they will lose 0.3.
The B score (execution value) is out of 10.0 and they recieve deductions for mistakes. For small mistakes gymnasts lose 0.1 such as unpointed toes, small leg separations, small wobbles on beam, deviation from a straight line on vault.
For medium mistakes gymnasts lose 0.3 - examples - large leg separation, moderate bent knee's or bent arms, lack of height in casts, lack of split in leaps.
For large mistakes they lose 0.5 - example - hitting feet on apparatus on bars, significant bend in arms or legs.
For very large mistakes gymnasts lose 0.8 - such as a fall, hitting feet on floor on bars, 3rd run approach on vault, bars or beam.
It gets even more complicated for the higher levels.