Adding and Subtracting 2-Digit Numbers with Exchange — Interactive Lesson (Year 2)

What happens when the ones add up to more than 10? This 26-slide interactive lesson teaches adding and subtracting 2-digit numbers with exchange, using base 10 to make the process visible.

Mastering Adding and Subtracting 2-Digit Numbers with Exchange in Year 2 Maths

Pupils work out additions and subtractions where they exchange 10 ones for 1 ten, using their knowledge of place value to support understanding. They complete tables to find how many ones and tens are in a number, use base 10 to build numbers such as 52 before adding more ones and tens, and work through calculations such as 36 + 27, breaking the ones and tens apart step by step. Later questions use pictorial base 10 representations and ask pupils to find a missing digit that makes a calculation correct.

What’s Included

• 26-slide interactive lesson on adding and subtracting 2-digit numbers
• Learning objectives on exchanging 10 ones for 1 ten
• Base 10 representations throughout
• Step-by-step calculations such as 36 + 27
• Missing-digit reasoning questions with instant feedback

Key Benefits for Students

• Makes the exchange process visible with base 10
• Builds a step-by-step method for calculations across a ten
• Links place value directly to the exchange process
• Instant feedback on answer questions

Why Teachers Love It

• No prep — ready for whole-class teaching on an interactive whiteboard
• A structured lesson that can be split across sessions
• Self-marking questions support independent practice
• Suits teaching, revision and homework
• A dependable foundation before formal column methods

Love this? You’ll love…

• Adding and Subtracting 1s, 10s and 100s — Interactive Lesson (Year 2)
• Writing Numbers in Words and Figures — Interactive Lesson (Year 2)
• Number Bonds to 10 — Interactive Lesson (Year 2)

A dependable addition to a Year 2 place value topic, giving pupils a clear, visual method for the trickiest part of two-digit addition and subtraction. Confident exchanging here is what makes formal column methods make sense later on.

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FAQs

What year group is this for?
Year 2 (ages 6–7), KS1.

Does it use base 10 equipment?
Yes — base 10 is used throughout to model exchanging.

Is it self-marking?
Yes, with instant feedback on the questions.