Adding and Subtracting 1s, 10s and 100s — Interactive Lesson (Year 2)

Why does only the tens column change when you add 20? This 22-slide interactive lesson teaches adding and subtracting 1s, 10s and 100s using place value charts.

Mastering Adding and Subtracting 1s, 10s and 100s in Year 2 Maths

Pupils add and subtract 1s from a given number, use models and representations including place value charts to explore the effect of adding or subtracting multiples of 10 and 100, and understand that adding or subtracting 100s only changes the hundreds column. They use known number bonds to support this, for example knowing 4 + 2 = 6 to work out that 400 + 200 = 600, and solve problems involving sweets, books, pencils and money using counters and a place value chart.

What’s Included

• 22-slide interactive lesson on adding and subtracting 1s, 10s and 100s
• Learning objectives on place value charts and number bonds
• Worked examples showing which column changes
• Real-life problems with sweets, books, pencils and money
• Fill-in-the-blank questions with instant feedback

Key Benefits for Students

• Builds a clear link between number bonds and larger calculations
• Uses place value charts to show exactly what changes
• Practises adding and subtracting 1s, 10s and 100s together
• 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 column addition and subtraction

Love this? You’ll love…

• Writing Numbers in Words and Figures — Interactive Lesson (Year 2)
• Number Bonds to 10 — Interactive Lesson (Year 2)
• Dividing by 2 — Interactive Lesson (Year 2)

A dependable addition to a Year 2 place value topic, giving pupils a clear method for adjusting numbers by 1s, 10s and 100s. This groundwork pays off directly when pupils meet formal column methods later on.

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FAQs

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

Does it cover 100s as well as 1s and 10s?
Yes — all three are covered in one lesson.

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