noun, noun which may take the genitive case particle 'no'
perfect score; full marks; perfection
Used for a score of 100 out of 100, or metaphorically for something flawless.
彼は数学のテストで百点満点を取った。
He got a perfect score on the math test.
このケーキは百点満
This cake is perfection.
noun
grading out of a hundred; on a scale of 0 to 100
Refers to the grading system itself, where the maximum is 100 points.
この試験は百点満点で採点されます。
This exam is graded out of a hundred.