The first blank requires "an" because the word "intrinsic" starts with a vowel sound. The article "an" is used before words starting with a vowel sound.
The second blank requires "the" because "school curriculum" refers to a specific curriculum, and we use the definite article "the" in such cases.
The sentence becomes:
Maths is an intrinsic part of the school curriculum.
The correct answer is "an...the".