Adding and Decomposing to 20 Worksheet – 1st Grade Addition Practice

The Adding and Decomposing to 20 Worksheet gives first grade students focused, no-prep practice with addition. It is a print-and-go math page that fits easily into a mini-lesson, a center rotation, or a quick review day.

Learning objective: Students will build accuracy and confidence with addition through short, focused practice that reinforces what was taught in class.

Why it works: Practice like this gives students a chance to try addition on their own after you teach it. Because the page is quick to complete and easy to review, it fits into almost any part of the school day.

What's included:

• 1 printable worksheet page

• Clear, student-friendly directions

• 3 practice sections (Part A to Part C)

• Answer key (1 page)

• Cover page

How it's organized: The page opens with these directions: "Write the sum. Then fill in the ten frames to show it." The practice is split into 3 parts, so students can work through it in clear steps.

Grade level: Designed for first grade students. It also works well for kindergarten and second grade students who need extra practice or a fresh review.

How to use it: Assign it after a mini-lesson, use it in a small group, send it home as homework, keep it in your sub folder, or use it as a quick formative check.

Answer key: An answer key is included, so you can check work quickly or let students self-correct.

Teaching tips and variations:

• Keep a few copies in your early finisher bin for independent review.

• Send it home as homework so families can see what their child is learning in math.

• Model the first item together, then let students finish the rest independently.

Skills covered: Addition, Math

Standards: Supports Common Core 1. OA.C.6, 1. OA.A.1.

File type: PDF, ready to print.

Number of pages: 3 (1 worksheet page, 1 answer key page, 1 cover page).

Looking for more addition practice? Visit the Have Fun Teaching shop for related worksheets, reading passages, and activities for first grade. Have Fun Teaching on Teach Simple