Adding 3 Whole Numbers within 20 Worksheet – 1st Grade Addition

Looking for simple, effective addition practice for first grade? The Adding 3 Whole Numbers within 20 Worksheet is a ready-to-print math resource that students can complete on their own after a short introduction.

Learning objective: Students will practice addition and apply the skill independently by completing each task on the page.

Why it works: Short, focused practice is one of the best ways to help first grade students remember a new skill. Clear directions mean students can get started quickly, and the simple format makes it easy for you to spot who needs more help.

What's included:

• 1 printable worksheet page

• Clear, student-friendly directions

• Answer key (1 page)

• Cover page

How it's organized: The page opens with these directions: "Add the three numbers in each problem. Write the sum on the line." Students then complete the practice items in order and check their work before turning it in.

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: Use it for whole-group practice, small-group instruction, independent work, centers, morning work, homework, or an emergency sub plan.

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

Teaching tips and variations:

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

• Pair students to compare answers and talk through any differences.

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

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).

Have Fun Teaching creates classroom-tested resources for PreK through 6th grade. Follow our shop to find more math worksheets that pair well with this page. Have Fun Teaching on Teach Simple