I created this doubles plus one strategy worksheet for my students to practice looking at a fact and relating it to their doubles facts to come up with the sum. If the fact is a doubles plus one, they color it orange. I thought this would be practice to help foster basic fact memorization. It could be great morning work, seatwork during math centers, homework, an assessment, etc. Also check out my adding doubles practice worksheet, as well as lots of other math addition and subtraction practice sheets and activities, centers, etc., which are all available in my TPT store. Enjoy!