**Tennessee Academic Education Standards**. An ordinal is an object’s position in the order of a group. An ordinal tells whether an object is first or fifth. Read More...

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TN.1.OA. Operations and Algebraic Thinking (OA)

1.OA.A. Represent and solve problems involving addition and subtraction.

1.OA.A.1. Add and subtract within 20 to solve contextual problems, with unknowns in all positions, involving situations of add to, take from, put together/take apart, and compare. Use objects, drawings, and equations with a symbol for the unknown number to represent the problem. (See Table 1 - Addition and Subtraction Situations)

1.OA.B. Understand and apply properties of operations and the relationship between addition and subtraction.

1.OA.B.4. Understand subtraction as an unknown-addend problem. For example, to solve 10 – 8 = ___, a student can use 8 + ___ = 10.

1.OA.C. Add and subtract within 20.

1.OA.C.5. Add and subtract within 20 using strategies such as counting on, counting back, making 10, using fact families and related known facts, and composing/ decomposing numbers with an emphasis on making ten (e.g., 13 - 4 = 13 - 3 - 1 = 10 - 1 = 9 or adding 6 + 7 by creating the known equivalent 6 + 4 + 3 = 10 + 3 = 13).

1.OA.C.6. Fluently add and subtract within 20 using mental strategies. By the end of 1st grade, know from memory all sums up to 10.

TN.1.NBT. Number and Operations in Base Ten (NBT)

1.NBT.A. Extend the counting sequence.

1.NBT.A.1. Count to 120, starting at any number. Read and write numerals to 120 and represent a number of objects with a written numeral. Count backward from 20.

1.NBT.B. Understand place value.

1.NBT.B.2. Know that the digits of a two-digit number represent groups of tens and ones (e.g., 39 can be represented as 39 ones, 2 tens and 19 ones, or 3 tens and 9 ones).

1.NBT.B.3. Compare two two-digit numbers based on the meanings of the digits in each place and use the symbols >, =, and < to show the relationship.

1.NBT.C. Use place value understanding and properties of operations to add and subtract.

1.NBT.C.4. Add a two-digit number to a one-digit number and a two-digit number to a multiple of ten (within 100). Use concrete models, drawings, strategies based on place value, properties of operations, and/or the relationship between addition and subtraction to explain the reasoning used.

TN.1.MD. Measurement and Data (MD)

1.MD.B. Work with time and money.

1.MD.B.4. Count the value of a set of like coins less than one dollar using the ¢ symbol only.

TN.1.G. Geometry (G)

1.G.A. Reason about shapes and their attributes.

1.G.A.3. Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths, and quarters, and use the phrases half of, fourth of, and quarter of. Describe the whole as two of, or four of the shares. Understand for these examples that partitioning into more equal shares creates smaller shares.

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