Math-u-see Alpha-pages 251-252

Megan is learning from Math-u-see that owe, means you are subtracting a given amount and is colored grey and "have" (in white) means this is how many you start with . It's a color system they use so that later the kids can understand the problem. She did some problems like this , just counting how many grey and how many white boxes there were. Then, She did some adding and some subtracting problems. Since there were not many subtraction problems, I added a row upon her request.  then, she did the problems they had.  On page 252, She did more adding problems. Weird. There should be more subtraction. I am not a big fan of this book, but she does it periodically.