1st Grade Subtraction Within 20 Worksheet | Missing Numbers & Fluency

A worksheet on subtraction within 10 and 20. The students are required to perform subtraction with numbers within 10 and 20 and numbers up to 10 so that the difference is within 10 and 20. The first exercise requires to perform subtractions between two numbers and the second exercise requires to find the missing number in given subtractions where the first number is within 10 and 20 and the second number is up to 10. There are two pages of exercises. Solutions are included.

Engage your Key Stage 1 students with this no-prep maths worksheet pack designed to build rock-solid subtraction fact fluency up to 20! This high-quality practice resource moves students past simple counting by targeting essential early milestones: subtraction from teen numbers and finding missing values in equations. Perfect for morning work, daily maths starters, homework, or small group intervention!

What is Included in This Resource?
This resource features carefully designed, structured sections to build complete subtraction mastery, complete with full visual solution keys for every question:

• Section A: Subtraction Fluency Within 20 (20 Questions): Rapid-fire practice subtracting single-digit numbers from teen numbers to build computational speed and confidence.
• Section B: Missing Numbers Challenge (24 Questions): Introduces early algebraic thinking by asking students to find the missing unknown value to make the equation true, including missing parts at the start or middle of the calculation (e.g., 11 - __ = 10 and __ - 5 = 10).

Why Teachers Love This Resource

• No Prep Required: Just print the pages and you are ready to teach!
• Scaffolded Skill Building: The worksheet naturally increases in difficulty by moving from straightforward calculation to missing-number problem solving.
• Full Answer Keys Included: Comes with a beautifully clear, completed visual layout so you can mark in seconds or allow students to self-correct.

Target Key Stages & Year Groups
This worksheet is perfect for Key Stage 1 (Year 1 and Year 2), and Lower Key Stage 2 (Year 3 Intervention) students.

UK National Curriculum Aligned:

• Year 1 Mathematics: Add and subtract one-digit and two-digit numbers to 20, including zero; solve problems with missing numbers.
• Year 2 Mathematics: Recall and use addition and subtraction facts to 20 fluently.