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Grades K–2 • 100% Free Printable Worksheet

Basic Addition Facts Worksheet Generator (Sums to 20 & 100)

Single-digit and double-digit basic facts for early fact fluency practice. Generate unlimited practice worksheets with answer keys for home or school.

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Worksheet Mill Code: 0028T5

Basic Addition Facts (Sums to 20 & 100)

Name: ________________________________ Date: ____________________ Score: _________

Find the sum for each addition problem.

1) 0 + 8 =     
2) 2 + 6 =     
3) 0 + 6 =     
4) 5 + 10 =     
5) 2 + 7 =     
6) 5 + 0 =     
7) 0 + 1 =     
8) 2 + 4 =     
9) 5 + 1 =     
10) 1 + 3 =     
11) 4 + 10 =     
12) 7 + 6 =     
13) 1 + 7 =     
14) 4 + 3 =     
15) 9 + 5 =     
16) 10 + 2 =     
17) 8 + 7 =     
18) 9 + 6 =     
19) 4 + 4 =     
20) 10 + 6 =     
21) 10 + 3 =     
22) 2 + 9 =     
23) 0 + 3 =     
24) 9 + 7 =     
25) 2 + 8 =     
Page 1 of 1 Free printable math worksheets at Worksheet Mill Code: 0028T5
Worksheet Mill ANSWER KEY Code: 0028T5

Basic Addition Facts (Sums to 20 & 100) — Answer Key

Find the sum for each addition problem.

1) 0 + 8 = 8
2) 2 + 6 = 8
3) 0 + 6 = 6
4) 5 + 10 = 15
5) 2 + 7 = 9
6) 5 + 0 = 5
7) 0 + 1 = 1
8) 2 + 4 = 6
9) 5 + 1 = 6
10) 1 + 3 = 4
11) 4 + 10 = 14
12) 7 + 6 = 13
13) 1 + 7 = 8
14) 4 + 3 = 7
15) 9 + 5 = 14
16) 10 + 2 = 12
17) 8 + 7 = 15
18) 9 + 6 = 15
19) 4 + 4 = 8
20) 10 + 6 = 16
21) 10 + 3 = 13
22) 2 + 9 = 11
23) 0 + 3 = 3
24) 9 + 7 = 16
25) 2 + 8 = 10
Page 1 of 1 Free printable math worksheets at Worksheet Mill Code: 0028T5

Ways to Use This Sheet

Morning Work

The first ten minutes while attendance is taken and students settle into the room.

Early Finishers

Quiet, independent drill ready in a binder for students who wrap up assignments ahead of schedule.

Homework

A clean, predictable practice sheet students can complete at home without adult coaching.

How to Use This Worksheet Generator

In the Classroom

Basic addition fact fluency is the foundational engine of early elementary mathematics. In the classroom, short daily 2-minute fact sprints allow teachers to assess automaticity without causing test anxiety. These worksheets offer selectable ranges (sums within 10 for kindergarten and 1st grade, sums within 20 for 1st and 2nd grade, and sums to 100 without carrying for 2nd grade mental math).

At Home & Homeschool

At home, consistent five-minute practice sessions help children bridge the gap between counting on fingers and instant mental recall. By printing fresh worksheets with random seeds, parents eliminate pattern memorization and encourage genuine number sense strategies such as making a ten or doubles plus one.

Step-by-Step Worked Example

Worked Example: Make-a-Ten Addition Strategy 8 + 7 = ?
  1. 1

    Identify the Distance to Ten

    Look at the larger addend (8). It needs 2 more to make a friendly benchmark of 10.

  2. 2

    Decompose the Second Addend (7 = 2 + 5)

    Break 7 into 2 and 5 so the 2 can join the 8.

  3. 3

    Combine to Find the Total (10 + 5 = 15)

    Add 8 + 2 = 10, then add the remaining 5 to arrive at 15 smoothly without finger counting.

Solution Result: 8 + 7 = 15

Difficulty Progression: Easy vs. Standard vs. Challenge

Preset Level Target Grade Configuration & Range Skill Focus & Mastery
Easy Kindergarten–Grade 1 20 problems, sums up to 10, horizontal layout Mastering number bonds of 5 and 10; basic single-digit fluency.
Standard Grades 1–2 25 problems, sums up to 20, includes zero facts Mastering the core single-digit addition facts table (0–9 addends) and bridge-to-ten facts.
Challenge Grade 2 25 problems, sums up to 100, vertical column alignment (no carrying) Applying single-digit facts to two-digit numbers (e.g., 43 + 5, 24 + 32) mentally.

Frequently Asked Questions

When should my child stop counting on their fingers for addition facts?

Finger counting is a natural developmental stage in kindergarten and early 1st grade. However, by mid-2nd grade, students should transition toward mental strategies like "doubles plus one" (6+7 = 6+6+1) or "make-a-ten" (8+5 = 8+2+3). Regular practice with randomized worksheets strengthens these neural pathways.

Why are horizontal addition problems helpful compared to vertical ones?

Horizontal formatting encourages algebraic thinking (such as seeing equations as balanced expressions) and promotes mental decomposing strategies. Vertical layout, on the other hand, reinforces the place-value column alignment needed for multi-digit carrying.

How many problems should a 1st grader complete in one sitting?

For 1st graders, 15 to 20 problems completed thoughtfully in 3 to 5 minutes is optimal. Quality of strategy and low stress yield far better long-term retention than high-volume repetitive drilling.

Understanding Your Unique Worksheet Code

Every worksheet generated on this site includes a unique 6-character alphanumeric Worksheet Code (such as 432VPD) printed in the header and footer.

This code represents the mathematical pseudo-random seed used to create your exact problem set. If you ever need to reprint the identical worksheet for absent students or retrieve the matching answer key at a later date, simply enter the code into the Worksheet Code box and click Load Code. All problems will instantly regenerate in identical order.