Step 1 is to do some pure numerical testing and simple word problem testing to see if it's a math issue or reading issue. The word problems in Eureka get pretty crazy and wander away from making mathematical sense.

Setness

Eureka is a lot of readings and writing. So depending on the grade of your child, they will struggle for that aspect alone. A PP mentioned Zearn which is fantastic. If you’re just looking for something to help your kid with their HW, I recommend https://embarc.online/. If you or your child need a video to walk through the HW or problem sets, use Mrs. Setbess on YouTube.