2.OA.A Represent and solve problems involving addition and subtraction
2.OA.A.1 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.OA.C Work with equal groups of objects to gain foundations for multiplication
2.OA.C.3 Determine whether a group of objects (up to 20) has an odd or even number of members (e.g., by pairing objects or counting them by 2s). Write an equation to express an even number (up to 20) as a sum of two equal addends.
2.NBT.A.1 Understand that the three digits of a three-digit number represent amounts of hundreds, tens, and ones; e.g., 726 equals 7 hundreds, 2 tens, and 6 ones. Understand that 100 can be thought of as a group of ten tens — called a "hundred." Understand that the numbers 100, 200, 300, 400, 500, 600, 700, 800, 900 refer to one, two, three, four, five, six, seven, eight, or nine groups of 100.
2.NBT.A.4 Compare two three-digit numbers based on meanings of the hundreds, tens, and ones digits, using >, =, and < symbols and correct terminology for the symbols to record the results of comparisons.
2.NBT.B.7 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 expression or equation.
2.MD.B.5 Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, and write equations with a symbol for the unknown number to represent the problem.
2.MD.B.6 Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2,..., and solve addition and subtraction problems within 100 on the number line diagram.
2.MD.D.9 Generate data by measuring the same attribute of similar objects to the nearest whole unit. Display the measurement data by making a line plot, where the horizontal scale is marked off in whole- number units. Generate data from multiple measurements of the same object. Make a line plot, where the horizontal scale is marked off in whole-number units, to compare precision of measurements.
2.MD.D.10 Draw a picture graph and a bar graph, with single-unit scale, to represent a data set with up to four categories. Solve simple put-together, take-apart, and compare problems using information presented in a bar graph.
2.G.A.1 Recognize and draw shapes having specified attributes (e.g., number of angles, number of sides, or a given number of equal faces). Identify triangles, quadrilaterals, pentagons, hexagons, and cubes.
2.G.A.3 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.