A number can be split and rebuilt, and that one idea transfers everywhere
A child learns that a number can be split and rebuilt, which is why 8 + 7 becomes 10 + 5, and why the same move still works at 38 + 7 and 138 + 7. They learn why ten is the number we bridge through, so it transfers instead of staying a rule.
Classes are live, in small groups of six, taught by top-2% teachers. Your child solves a few well-chosen problems covering every variation, rather than a hundred repetitive ones.