Missing Addend 1–20 Worksheets | Addition | Year 1 Maths

Help pupils build confidence with addition using these Missing Addend 1–20 Worksheets, designed for Year 1 Maths, KS1, and early learners.

This 12-page printable resource gives pupils focused practice finding the missing number in addition sentences. The worksheets gradually increase in difficulty, beginning with missing addends within 10 and progressing to addition problems within 20.

What’s Included

• 12 pages of missing addend practice
• Missing addends within 10, 12, 15, 16, 18, and 20
• Clear and simple addition equations
• Gradual progression from easier to more challenging questions
• Space for pupils to write their answers
• Suitable for independent practice, maths lessons, homework, morning work and intervention

Skills Practised

Pupils will practise:

• Finding a missing addend
• Completing addition sentences
• Understanding the relationship between addends and totals
• Developing addition fluency
• Solving addition problems within 20
• Building confidence with early number skills

Perfect For

• KS1 Maths
• Year 1 Maths
• Grade 1 Maths
• Early learners
• Addition practice
• Maths intervention
• Homework
• Independent work
• Morning activities
• Revision and assessment preparation

The worksheets use a consistent “Find the Missing Addend” format, making them easy for teachers to introduce and simple for pupils to understand. The progression from smaller totals to numbers within 20 provides repeated practice while gradually increasing the level of challenge.