This set includes 48 colorful number bond cards with three addends. It also includes number cards for the numbers 9-20 that can be used to match the bonds to the correct sums. These bonds are a good tool for students to develop fluency as well as discuss strategies and efficiency. They also support 1.OA.A.2, solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20. Students should be encouraged to share or write their thinking as they solve each bond. The bonds are designed to have a pair for ten or a pair of doubles within the three addends. The cards are good for instruction, class discussion, journals, and warm-ups.