Free · Printable · TEKS 1.3A,1.3B
Free Grade 1 Addition Within 20 Worksheets
925+ Texas TEKS-aligned practice questions on addition within 20. Print at home or practice online with a built-in AI tutor. No sign-up. No paywall.
Looking for addition within 20 worksheets for Grade 1? This page has 925+ TEKS-aligned practice questions on this exact topic, mapped to Texas TEKS 1.3A,1.3B. Every question goes through an AI quality gate before publishing — no typos, no wrong answer keys, no factually-broken explanations.
Add within 20 using strategies and basic facts.
Below: a sample of 8 questions with answers and explanations so you can see what's on the worksheet before you print. Each question has the correct choice marked and a one-line "why" so kids who get it wrong understand the fix.
What is 7 + 2?
- 9 ✓
- 10
- 8
- 11
Why: 7 + 2 = 9.
Add 3 and 3.
- 7
- 8
- 6 ✓
- 5
Why: 3 + 3 = 6.
1 + 1 = ?
- 3
- 1
- 4
- 2 ✓
Why: 1 + 1 = 2.
6 + 9 = ?
- 16
- 17
- 14
- 15 ✓
Why: 6 + 9 = 15.
Find the sum of 16 and 1.
- 17 ✓
- 16
- 19
- 18
Why: 16 + 1 = 17.
What is 7 + 10?
- 16
- 19
- 17 ✓
- 18
Why: 7 + 10 = 17.
Add 16 and 1.
- 18
- 19
- 17 ✓
- 16
Why: 16 + 1 = 17.
Find the sum of 4 and 10.
- 15
- 14 ✓
- 16
- 13
Why: 4 + 10 = 14.
Common questions
Are these worksheets really free?
Yes. Free to print, free to practice online. No email, no sign-up, no paywall. We make money from optional paid features (toy redemption with real cents), not from the worksheets.
What is TEKS 1.3A,1.3B?
TEKS 1.3A,1.3B is the Grade 1 Addition Within 20 standard from the Texas Essential Knowledge and Skills. Add within 20 using strategies and basic facts.
How many total questions are available?
925+ questions in our Grade 1 Addition Within 20 bank. Print as many 20-question worksheets as you like — each one pulls a fresh set so your kid doesn't see the same questions twice.
Where do these questions come from?
Generated by our AI pipeline, then quality-gated by two independent models (gpt-4o for content review, Claude Sonnet 4.5 for math verification) before publishing. Every question is tagged to TEKS 1.3A,1.3B and modeled on real STAAR item shapes.