Related subtraction facts

Learning Objectives Identify the whole and parts in a number set. Explain what a fact family is. Write two related subtraction facts for a given fact family. Use addition to check their subtraction answers. Solve simple word problems using related facts. Create a fact family triangle for a set of numbers. Did you know numbers can be in a family, just like you? 👨‍👩‍👧 Let's meet some number families! We will learn about special number groups called fact families. This helps us find two subtraction facts that are related. It makes subtraction super easy and fun! ✨ Real-World Applications Sharing cookies with a friend 🍪 Finding out how many toys are left 🧸 Seeing how many balloons flew away 🎈 Counting how many fish are hiding 🐠

TermDefinitionExample Fact FamilyA group of three numbers that are related. They can make addition and subtraction sentences.The numbers 4, 5, and 9 are a fact family. They live in the same house! 🏠 WholeThe biggest number in the fact family. It's like the total number of items you start with.In the family 4, 5, 9, the whole is 9. You have 9 yummy cupcakes. 🧁 PartsThe two smaller numbers in the fact family. They add up to make the whole.In the family 4, 5, 9, the parts are 4 and 5. 4 + 5 = 9. SubtractionTaking away one number from another. It tells you how much is left.If you have 5 balls ⚽ and 2 roll away, you have 3 left. 5 - 2 = 3. Related Subtraction FactsTwo subtraction sentences that use the same three numbers from a fact family.For the family 4, 5, 9, the related subtractio...

First Subtraction Fact Rule Whole - Part 1 = Part 2 Always start with the biggest number (the whole). Then, take away one of the small numbers (a part). Second Subtraction Fact Rule Whole - Part 2 = Part 1 Again, start with the biggest number. This time, take away the other small number.