Besides Kuman, XtraMath.org is still free, too.

One of the big perks when I retired was not having to deal with Investigations math any longer. So it's not just parents who don't "appreciate" the " improvements. " When we first switched I did some research and discovered that there were a lot of red flags. Parents in districts across the country protested it's implementation including parents with masters and/or PhDs in math.

There are ways to make drill practice fun. The American version of Singapore Math includes an activity called "Sprint." You pass out a sheet with the same 100 math facts printed on both sides. Give the children a time limit to complete as many as possible. Then you call out the answers and they correct their own paper and record the number correct at the top. Then they turn the paper over and you repeat the procedure. When finished ask how many have more correct the second time. Have the children ball up their papers. The children with the most correct get to be the first to toss their their paper in the trashcan that you hold up! They absolutely love throwing paper balls at the teacher, excuse me, the trashcan!