I've had a number of requests to create another addition or subtraction worksheet. Sorry it's taken so long, but here you go!
Students must look at each number sentence and decide it an addition or subtraction sign is needed. If you are putting it in a math station or setting it out for early finishers I have included an "I can" student instruction card. Of course, it could also be used whole class.
You can download this freebie HERE from Google Docs.