Looking for addition within 20 worksheets that build fluency step by step? This set of 10 no-prep math worksheets takes students from basic addition facts all the way to making 20 — perfect for Grade 1 and Grade 2.

Each worksheet follows a clear theme and gradually increases in difficulty — starting with smaller sums, bridging through the teens, and finishing with number pairs that make 20.

Three levels of challenge per page:

• solve addition equations (problems 1–8)
• find the missing addend in vertical equations (problems 9–12)
• a unique Bonus Challenge that builds critical thinking on every page.

The Bonus Challenges are varied and creative — students count how many answers share the same sum, find number pairs that make 20, spot the second biggest answer, and more. No two pages are the same.

What's included:

• 10 student worksheets
• Answer key for all 10 worksheets
• Print-and-go, no prep needed

Best for:

Grade 1 · Grade 2 · Addition facts · Missing addend · Making 20 · Math centers · Morning work · Homework · Sub plans · Early finishers

You may also like:

• Addition Within 10
• Subtraction Within 10
• Subtraction Within 20