Two-Digit Addition & Subtraction Fact Families

$Two-Digit Addition & Subtraction Fact Families$

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Year 2 Mathematics Learning about number relationships Using part-part-whole reasoning

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WALT - We Are Learning To

Write and use two-digit addition and subtraction fact families Apply part-part-whole reasoning to solve problems Represent number relationships with bar models Use mental calculation strategies confidently

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Success Criteria

I can identify related addition and subtraction facts I can use part-part-whole diagrams and bar models I can write correct number sentences I can apply mental calculation strategies like bridging ten

$Review: One-Digit Fact Families$

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Review: One-Digit Fact Families

Let's remember: 3 + 4 = 7 The fact family includes: 4 + 3 = 7 7 - 3 = 4 7 - 4 = 3

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Two-Digit Fact Families

Let's try: 34 + 15 = 49 The whole is 49 The parts are 34 and 15 This gives us four related facts!

$Complete Fact Family: 34 + 15 = 49$

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Complete Fact Family: 34 + 15 = 49

$Hands-On Practice$

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Hands-On Practice

Work in pairs with base-ten blocks Build the number 56 using blocks Split it into two parts Record your fact family Draw a bar model to match

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Reflection & Next Steps

What mental strategies did you use today? How are addition and subtraction connected? Can you create your own fact family?

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