**1st Grade Math Skills**

**Unit 1: Add and Subtract Within 20**

* count and write numbers forward starting at any number less than 100

* count backwards within 20 to solve addition and subtraction problems

* add and subtract within 20 to solve word problems using number lines and ten frames

* compose and decompose numbers to 20 (10s and 1s using base 10 blocks)

* turn around facts - addition within 20

* solve subtraction word problems using unknown addend within 20

**Unit 2: Word Problems Involving Addition and Subtraction**

* understand the equal sign; determine if an equation is true or false

* find the missing number in any position in an addition or subtraction equation

* count forward to 120

* read and write numbers to 120

* solve addition and subtraction word problems within 20

* solve addition word problems with 3 numbers within 20

**Unit 3: Understanding Place Value**

* mentally find 10 more or 10 less than a number within 100

* subtract multiples of 10 from multiples of 10 within 100

* decompose two digit numbers into 10s and 1s

* compare two 2 digit numbers using <, >, and =

* add a 2 digit and a 1 digit number

* add a 2 digit number and a multiple of 10

* compose and decompose numbers, and when necessary, exchange 10 ones for a ten

**Unit 4: Measurement and Shapes**

* tell and write time to thehour and half hour

* measure and compare objects using non-standard units

* use the terms *shorter than* and *less than* to compare two objects

* order three objects by length (long, longer, longest)

* draw and build shapes when given a number of sides and/or corners

* name the attributes of a given 2 dimensional shape (triangle, rectangle, hexagon, square)

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**Unit 5: Reason with Shapes and Their Attributes**

* compose 2-D shapes (rectangles, squares, trapazoids, triangles, half-circles, and quarter circles)

* compose 3-D shapes (cubes, rectangular prisms, circular cones, circular cylinders)

* partition circles and rectangles into 2 or 4 equal shares

* use the phrases half of; fourth of; quarter of; halves

* create equivalent sums (ie. 13+5=18 is the same as 10+8=18)

* organize, represent, and interpret data in up to 3 categories

* compare data in a chart (more than; less than; equal to)