2.1.1.b.iii Add and subtract within 1000, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method.
2.1.2 Formulate, represent, and use strategies to add and subtract within 100 with flexibility, accuracy, and efficiency
2.1.2.a Represent and solve problems involving addition and subtraction.
2.1.2.a.i Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.
2.3.1 Visual displays of data can be constructed in a variety of formats to solve problems
2.3.1.a Represent and interpret data.
2.3.1.a.i Generate measurement data by measuring lengths of several objects to the nearest whole unit, or by making repeated measurements of the same object. Show the measurements by making a line plot, where the horizontal scale is marked off in whole-number units.
2.4.1.d Partition circles and rectangles into two, three, or four equal shares, describe the shares using the words halves, thirds, half of, a third of, etc., and describe the whole as two halves, three thirds, four fourths.