Build it right early — don't patch it later
Multiplication needs addition genuinely understood, not just recited. Fractions need place value. When a young child memorises instead of understanding, it holds up for a while — and then it doesn't.
Your child learns why 7 × 6 is the same as 5 × 6 + 2 × 6, why borrowing works, why a fraction is one number and not two stacked on top of each other. Get that right early, and your child never files math under "things I'm bad at." You are not fixing a struggle later — you are making sure it never takes root.