Mental math and Times Tables in SCM books

I have two questions. I am using SCM book 1 with my second son. When I do the last 5 minutes of review with him each day, is he supposed to be doing these questions with or without manipulatives? My understanding is that the first book is the exploration of numbers 1-100 so manipulatives are allowed to be used as needed. Is this right? Otherwise, it seems that he would be expected to know some pretty advanced sums without even having his addition tables memorized…..rather, he needs to demonstrate his ability to understand and work with these numbers as advanced. Is this correct?

My second question is regarding SCM book 3. My oldest son is working through the times tables. He has no problem understanding the concept but memorizing the tables is definitely taking some time. I don’t want him to get bored with the repetition when he understands the concept but just needs practice. The 5 minutes review at the end of the lesson is helpful for reviewing these facts. I’m just looking for input from other users. Is there anything you do to help add variety to your lessons when working through learning the multiplication tables? I wonder if maybe I should just move on after a bit and continue practice during the review time….

I appreciate any input….