South Carolina 1st grade math standards

Classify shapes as two-dimensional/flat or three-dimensional/solid and explain the reasoning using formal mathematical language.

Partition in multiple ways squares, rectangles, and circles into two or four equal-sized parts. Name the pieces as halves and fourths.

Identify and describe a given shape in everyday situations to include two-dimensional shapes and three-dimensional shapes.

Sort a mixed set of polygons and describe the reasoning used while sorting the polygons.

Analyze and compare a pair of two-dimensional shapes or a pair of three-dimensional shapes of assorted sizes and orientations using formal mathematical language.

Identify and describe the attributes of two-dimensional shapes and three-dimensional shapes.

Identify and write the values of a coin or a bill using a ¢ symbol for coin values or symbol for bills.

Use nonstandard physical objects to estimate and then measure the length of an item as the number of same size units of length with no gaps or overlaps.

Sort pictures or objects into at least three categories (not to exceed 10 items in each category).

Create a survey question and collect data with up to three categories.

Count a collection of like coins to determine the total value of the set.

Order three objects by length from shortest to longest and longest to shortest using direct comparison.

Use analog and digital clocks to tell and record time to the hour and half hour.

Compare representations of two numbers up to 100 using the phrases is greater than, is less than, or is equal to (the same value as).

Represent and explain that whole numbers 1 through 99 are organized into groups of tens and ones, and a digit has a different value depending on its placement.

Compose and decompose whole numbers from 1 through 99 in more than one way using tens and ones.

Count by ones forward or backward starting at any number up to 120 making accurate decade transitions.

Apply place value reasoning to identify the number that is one more and one less, ten more, and ten less than a given number with up to two digits.

Find the difference between two numbers that are multiples of 10, both in the range 10–90, and write the corresponding equation. Explain the reasoning used.

Find the sum of a two-digit number and a one-digit number or a two-digit number and a multiple of 10 (1–99) using concrete models, drawings, and strategies that reflect place value understanding, the inverse relationship of addition and subtraction, and the properties of the operations to justify the sum.

Read, write, and represent numbers to 100 using concrete models, drawings, standard form, base ten language, and equations in expanded form.

Skip count by fives and tens from any multiple of five to 100, identifying place value patterns in the sequence.

Create, describe, and extend (to the next term) a growing shape pattern.

Determine and explain if an equation within 10 is true using a variety of equation formats.

Add and subtract number combinations flexibly and accurately within 10.

Solve add-to, take-from, and part-part-whole real-world situations to find sums and differences within 20.

Create, describe, and extend (to three terms within a sequence) repeating patterns using AB, AAB, ABB, and ABC type patterns.

Determine an unknown number in addition and subtraction equations within 10.

Compose and decompose numbers less than or equal to 20 in more than one way. Record each composition or decomposition as an equation.

Apply and explain the Commutative Property of Addition to find the sum (through 20) of two addends and explain that the value does not change when the order of the two numbers changes.