Lets turn both into fractions.
Jeremiah's test score: 8/10
Mariah's test score: 36/40
Find common denominators.
8/10
36/40 → 18/20 → 9/10
Determine which score is great using an inequality.
8/10 < 9/10
Therefore, Mariah got the greater fractions of problems correct.
Best of Luck!