Connecting Addition and Subtraction to 20 - 1st Grade

This pack of resources is ideal preparation for the more formal work with building fluency in addition and subtraction with equations within 20

This collection offers a comprehensive approach to teaching the connection between addition and subtraction. It provides various perspectives, including viewing them as inverse operations, opposite actions, or movements on a number line. The materials are designed to support educators through five stages with worksheets and interactive teaching tools.

1. Commutative Addition

Students count objects and fill in two addition equations, demonstrating addition's commutative property. 

2. Subtraction Practice

Learners count objects and complete two subtraction equations.

3. Number Bond Exploration

Starting with a review of number bonds, four worksheet sets focus on finding sums or parts up to 20. A blank template is included for custom challenges or student-created worksheets.

4. Number Family Connections

Building on previous lessons, students construct four possible equations using three related numbers.

5. Number Lines

Students explore how adding and subtracting the same number returns them to the starting point, illustrating the inverse relationship. 

6. Inverse 2 -  Building the Inverse Equation
Given the equation 7 + 12 = 19 complete the Equation 19 - ? = 7

How many Worksheets in each Set ?
Almost unlimited At the click of a button all numbers are randomised, so the questions change every time.  This will allow you to create as many new worksheets you will need for practice throughout the year (classwork, homework, revision, fillers etc) or even give small groups of students in your class different sets of questions either at the same level or differentiated. There will certainly be enough to ensure fluency in this topic. 

As these worksheets need little explanation, they are ideal if you need to leave work for a replacement teacher.

Answers can be found on the second page of every worksheet, automatically generated when you create a new worksheet.

Note
These resources are PDF documents and work with the official  Adobe Acrobat Reader on Windows or Mac computers with the randomising buttons also working via a touchscreen (PC or Mac)or on an Interactive Whiteboard.

Three other sets of resources are linked to this pack

1. If you decide to dowload this resources but find it would be useful for some of your pupils to practice within a range of a numbers from 1 to 10, go here: Connecting Addition and Subtraction - Kindergarten
   

2. This pack with its range of visual models is excellent preparation for building fluency mental math strategies applied to equations in Add and Subtract up to 20 with Equations
   

3. Adding 3 Numbers Up to 20: A Multilevel Approach then takes the skills learnt to another level but still remaining within 20 (although there are some worksheets in the Challenge section that go up to 50)