Relate addition and subtraction sentences

Learning Objectives Identify the 'parts' and the 'whole' in a number bond. Write two addition sentences for a given set of three numbers. Write two subtraction sentences for a given set of three numbers. Explain that addition and subtraction are opposites. Create a complete 'fact family' using a number bond. Use an addition fact to help solve a subtraction problem. Look! 🐶🐶 Two puppies are playing. 🐶 Three more puppies join them! How many puppies are there now? What if three puppies run away? We will learn how addition and subtraction are best friends! They are related and can help each other. This makes solving math problems much easier. ✨ Real-World Applications Sharing your toys with a friend. Eating some of your yummy snacks. 🍎...

TermDefinitionExample PartA smaller number that is part of a bigger number. Like one piece of a puzzle. 🧩In 2 + 3 = 5, the numbers 2 and 3 are the parts. WholeThe total number when you put the parts together. It's the biggest number. 👑In 2 + 3 = 5, the number 5 is the whole. Number SentenceA math sentence with numbers and signs like + or -. It tells a math story.4 + 5 = 9 is a number sentence. Related FactsAddition and subtraction sentences that use the same three numbers. They are a team! 🤝3 + 6 = 9 and 9 - 6 = 3 are related facts. Fact FamilyA group of four related facts. They all use the same three numbers. 👨‍👩‍👧The fact family for 3, 6, and 9 is: 3+6=9, 6+3=9, 9-3=6, 9-6=3. Number BondA picture that shows how numbers are connected. It has one circle for the whole and two fo...

Addition Rule Part + Part = Whole When you add the two small numbers (parts), you get the big number (the whole). Subtraction Rule Whole - Part = Part When you subtract one part from the whole, you get the other part.