This Fill the Missing Numbers worksheet provides mixed review practice using number sequences from 1 to 20.
Children fill in the missing numbers to complete each sequence, applying everything they have learned throughout the series.
This page works well as a review, extension, or assessment-style activity.
What’s Included in This Worksheet
This mixed practice worksheet includes:
- Five number sequences, each containing six numbers
- A mix of two missing numbers and three missing numbers
- Number ranges covering 1–20
- Carefully varied blank positions to encourage reasoning
- A clean, distraction free layout for focused learning
The variety helps teachers and parents see how confidently children apply sequencing skills.
How to Use This Worksheet
Instruction:
Fill in the missing numbers.
Helpful tips for adults:
- Encourage children to look at the whole sequence first
- Ask which numbers are already known
- Let children explain how they found each missing number
- Use this page to observe problem solving strategies
This worksheet works well with pencils and supports quiet, independent math practice.
Skills This Worksheet Supports
Completing this worksheet helps children strengthen:
- Number sequencing and order
- Understanding of numbers 1–20
- Logical reasoning
- Working memory
- Problem solving confidence
- Attention and focus
These skills are essential for success with addition, subtraction, and early mental math.
Why Mixed Review Is Important
Mixed review pages help children apply learned skills without relying on predictable patterns.
They also allow adults to identify areas where a child may need extra practice or support.
This worksheet provides that opportunity in a clear, supportive format.
Who This Worksheet Is For
This worksheet is suitable for:
- Kindergarten students
- Early primary learners
- Confident preschoolers ready for review
- Homeschool learning
- Classroom math centers or assessments
Numbered worksheets allow children to complete pages in any order and revisit them as needed.
Download the free PDF below and help your child practice missing number sequences from 1 to 20 through thoughtful, hands on learning.
Explore more printable math worksheets in our Counting Activities Collection.
