Common Core State Standards

# CCSS.MATH.CONTENT.1.OA.B.4

Understand subtraction as an unknown-addend problem. For example, subtract 10 - 8 by finding the number that makes 10 when added to 8.

16 teaching resources for those 'aha' moments

### Subtraction Strategies Using Addition Worksheet

Use addition to solve subtraction problems with this worksheet.

2 pages Grades: 1 - 2

### Fact Family Find and Flip - Addition and Subtraction Up to 20

Addition and subtraction game cards demonstrating the relationship between fact families.

1 page Grades: 1 - 2
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A set of 16 task cards that include word problems practicing addition and subtraction with 10.

6 pages Grades: K - 1
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Practice addition and subtraction within 10 with this set of 18 word problem task cards.

9 pages Grades: K - 1

### Addition and Subtraction Mat - Apple Tree

A hands-on activity to use with your students when learning to solve addition and subtraction problems up to 10.

2 pages Grades: PK - 1

### My Tens Frames - Template

A template to use when working on counting, addition and subtraction, odd and even numbers, or place value.

1 page Grades: K - 1

### Number Chart – 1-50

A bright number chart representing numbers 1-50.

1 page Grades: K - 2

### Number Chart – 1-20

A bright number chart representing numbers 1-20.

1 page Grades: PK - 1

### Math Warm-Ups Interactive PowerPoint - Grade 1

A PowerPoint providing a series of warm-up activities for Grade 1 students across the mathematics curriculum.

### Number Talks - Fluency to 20 Task Cards

Build number sense skills with this set of 24 task cards.

24 pages Grades: 1 - 3

### Number Talks - Making Ten Task Cards

Build number sense skills with this set of 20 task cards.

10 pages Grades: K - 3

### Addition and Subtraction Fact Families PowerPoint

A 19-page editable PowerPoint to use in the classroom when introducing addition and subtraction fact families.

19 pages Grades: 1 - 2

### Fact Family Fishbowls - Blank Version

A sorting activity to demonstrate an understanding of fact families.

3 pages Grades: 1 - 3

### Math Work Mats

A set of 5 work mats for students to use when working on specific math concepts.

5 pages Grades: 1 - 5

### Friends of 10 - Addition Match-up Activity

A set of 22 matching cards to explore the number combinations of 10.

6 pages Grades: K - 2

### Mental Math Subtraction Posters

9 posters outlining mental math strategies for subtraction.

9 pages Grades: 1 - 5