My 8yo son is currently using Horizons 3rd grade math. We both like the worksheets and that it has built in review. He's moving through it fine, but I feel like we're reaching a point where he is looking for more of the "why" not just the "how". I'm not looking to abandon the curriculum entirely, but I'm looking for something to add to round out the conceptual side of math that I feel is lacking. I've seen a lot of people talking positively about RightStart, Singapore (I see there are 2 options, Dimensions Math and Primary Math - happy to hear about both of these), and Math in Focus and would love some feedback. In my mind, the ideal situation would be for him to complete 1 page of Horizons a day as review work (he really goes through them quickly) along with 1 lesson from something more in depth. I don't mind spending 30 or so minutes a day of active teaching time on math, so if something is more teacher-centric that's not a deal breaker. We tried Beast Academy and he was luke warm about it, and to be honest I was too. I think it's a great program, just not a good fit for us. I had seen in another post that someone was using a RightStart/Horizons/Singapore Challenging Word Problems combination which (without actually doing it) seems very well rounded. I'm open to any thoughts and suggestions! Thanks!