Note: these resources all use the CGI names, not the Common Core names
| Common error: | What to read or do |
Confusing PPW-WU and JRU (ASU) (if you answered one and it should have been the other) |
Use the resources from the two ways of looking at addition lesson |
| Confusing join (Add to) problems with separate (Take From) problems | Use the resources from the addition and subtraction as actions lesson |
| Confusing change unknown, start unknown and result unknown (in Join or Separate) | Watch about the different unknowns in this video on Join problems and this video on Separate problems |
| Confusing JCU (ACU) with SRU (TRU), PPW-PU or CDU | Watch this |
| Confusing CQU and CRU | Use the resources from the variations on compare problems lesson |