Add Three Numbers

(C) Compose 10 with two or more addends with and without concrete objects

(G) Apply properties of operations to add and subtract two or three numbers.

(Y1) Represent and solve simple addition and subtraction problems using a range of strategies including counting on, partitioning and rearranging parts (ACMNA015)

1.OA.2 Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem.