I just started Singapore Math with my daughter. We are doing Primary Mathematics 1A and I am confused by the "Mental Math" assignments. Each lesson generally requires that we end with "Mental Math" exercises, but I can't find any explanation about how we are supposed to do them. At this level, they are generally just lists of basic addition and subtraction problems. Am I supposed to read these problems aloud and make my daughter figure it out in her head and answer orally? Or am I supposed to have her read it and write the answers? Am I supposed to make sure she is using the particular strategy for problem solving that we just learned in the applicable lesson?