I use my Mr. and Mrs. Fix It Missing Addends activity to challenge some of my students who have gained a solid understanding of addition.
Students need to match cards to find the missing addend. An I can ... student instruction card is included to keep them on task and a recording page to check for understanding.
Here's a peek...
and here's my activity ready to go!
If you already own this activity you can head on over to TPT and re-download for free.
If you do not have a copy but would like one just be one of the first 3 people to comment on this post and I'll send it along.