Solve real-world/story problems using addition (as a joining action and as a part- part-whole action) and subtraction (as a separation action, finding parts of the whole, and as a comparison) through 20 with unknowns in all positions.
Solve real-world/story problems using addition (as a joining action and as a part- part-whole action) and subtraction (as a separation action, finding parts of the whole, and as a comparison) through 20 with unknowns in all positions.