Any math teachers in the house? Really need help with teaching my kids math :(

So my 9-year old is struggling big time with math.

Dad is a buffoon who hates math, and is also afraid & concerned that I am confusing my daughter even more.

Just looking for some advise on any websites or apps we can try to help her out. Right now she's in 4th grade and in the midst of double-digit multiplication and just starting division.

Homework has become an absolute nightmare, could really use some insight if anyone has experiences similar issues. :(