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, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.

Standard:

Math.2.MD.4 or 2.MD.A.4

Description:

Measure to determine how much longer one object is than another, expressing the length difference in terms of a standard length unit.

Standard:

Math.2.MD.5 or 2.MD.B.5

Description:

Use addition and subtraction within 100 to solve word problems involving lengths that are given in the same units, e.g., by using drawings (such as drawings of rulers) and equations with a symbol for the unknown number to represent the problem.

Standard:

Math.2.MD.6 or 2.MD.B.6

Description:

Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, ..., and represent whole-number sums and differences within 100 on a number line diagram.