We are currently working through Saxon 1/2 and our DS finds it really boring. He grasps the concepts easily and can proficiently demonstrate what he has learned when asked. But, when he has to sit and work quietly on the practice questions his boredom causes him to make an abundance of computational errors (e.g., ignoring a decimal, 1+2=12, copying a problem incorrectly, etc...). He's a bright child, so I mark any wrong answers and allow him one opportunity to fix any errors on a separate sheet of paper. Depending on his attitude he either makes all of the necessary corrections or gets lost in thought and "forgets" which answers needed to be corrected.
I've cut out most of the practice questions, but he still seems pretty unmotivated by Saxon's approach.
Can someone recommend a more visual 6th grade math curriculum? And, can anyone offer some tips to strengthen his computation skills?