2.PAFR.1: Understand and apply properties of operations and the relationship between addition and subtraction to solve problems.

Understand and apply properties of operations and the relationship between addition and subtraction to solve problems.

2.PAFR.1.1Use a strategy to accurately find sums and differences of two-digit numbers within 100 and justify the sum or difference.2.PAFR.1.2Determine and explain if an equation (within 20) is true using a variety of equation formats.2.PAFR.1.3Solve one-step add-to, take-from, part-part-whole, and additive comparison real-world situations through 99 with the unknown in any position.2.PAFR.1.4For any number from 0 to 99, find the number that makes 100 when added to the given number.2.PAFR.1.5Add and subtract number combinations flexibly and accurately within 20.2.PAFR.1.6Apply the Associative Property of Addition to find the sum (through 20) of three addends and explain that the value can be found using various grouping strategies.2.PAFR.1.7Determine the unknown number in addition and subtraction equations within 20, with the unknown in any position.2.PAFR.1.8Sort a collection of 20 or fewer objects into two groups to determine if the number of objects is even or odd.2.PAFR.1.9Find the total number of objects arranged in equal groups or in a rectangular array and write an addition equation to express the total as a sum (up to 25) of equal addends.

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