1.OA.6 – Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90, using concrete models or drawings and strategies based on place value, properties of operations, and/or relationship between addition and subtraction.
2.OA.1 – Using addition and subtraction within 100 to solve one-and two-step word problems involving situations of additing to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
What do you notice? What do you wonder?
Focus questions – How far did the yellow car go? How far did the black car go? Which one went farther and by how many cubes?