You can not learn anything lemaaseh if you don't know metzius. Math is metzius. Lot's of halacha depends on a metzius which nowadays is covered by science. While every community decides for themselves how and to what extent to teach them, to say that knowledge of math and science is the antithesis of being a frum Jew is not just wrong, it is ludicrous.

"Math" as an integral part of Torah is definitely not an antithesis to being a frum Jew. תנאים, אמוראים, ראשונים and אחרונים all knew "math". All you need to do is open up a Chumash with Rashi, Mishnayos and Gemara to see that. The question is whether the knowledge was acquired as part of learning Torah, or as a separate curriculum.

To that end, my SIL developed a curriculum that teaches the "math" in Torah (not sure if it goes to 6th or 8th grade) called הייליקע נומערן. Upon completion of the curriculum students should be able to master math to a level that will allow them to create a Jewish calendar (based on calculations explained by the Rambam in הלכות קידוש החודש).