Operations & Algebraic Thinking

Grade 1 Math

4 topics13 lessonsCommon Core Standards

Students in Grade 1 work with addition and subtraction operations, solve word problems, and understand the relationship between addition and subtraction.

Addition Within 20

Learn strategies to add numbers with sums up to 20.

20 minutes2 lessons
CoursePracticeTest

Subtraction Within 20

Learn strategies to subtract numbers within 20 using various methods.

15 minutes2 lessons
CoursePracticeTest

Word Problems

Solve word problems that call for addition and subtraction of numbers within 20.

25 minutes2 lessons
CoursePracticeTest

Equations & Properties

Work with addition and subtraction equations and understand properties of operations.

30 minutes7 lessons
CoursePracticeTest

Tools

Number Line

Use a number line to count and compare numbers.

Try Tool

Ten Frame

Use a ten frame to count and compare numbers.

Try Tool

Standards Alignment

Common Core Standards - Grade 1

1.OA.A.1

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions.

1.OA.A.2

Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20.

1.OA.B.3

Apply properties of operations as strategies to add and subtract.

1.OA.B.4

Understand subtraction as an unknown-addend problem.

1.OA.C.5

Relate counting to addition and subtraction.

1.OA.C.6

Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

1.OA.D.7

Understand the meaning of the equal sign, and determine if equations involving addition and subtraction are true or false.

1.OA.D.8

Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.