Addition sentences: true or false?

Learning Objectives Identify the parts of an addition sentence. Define 'true' and 'false' in a math context. Determine if an addition sentence within 20 is true. Determine if an addition sentence within 20 is false. Explain why an addition sentence is true or false using objects or drawings. Correct a false addition sentence to make it true. If I have 3 red crayons 🖍️ and 2 blue crayons 🖍️, is it true that I have 5 crayons in all? 🤔 Today, we will be Math Detectives! 🕵️‍♀️ We will look at addition sentences. Our job is to figure out if they are true or false. Real-World Applications Checking if you have enough snacks for friends. Sharing toys fairly with a sibling. Counting your stickers to see if the total is right. Making sure you get the ri...

TermDefinitionExample Addition SentenceA math sentence that uses a plus sign (+) and an equal sign (=).4 + 5 = 9 is an addition sentence. It tells a number story. Plus Sign (+)This little sign means 'add' or 'put together'.In 6 + 2, the plus sign tells us to add 6 and 2. Equal Sign (=)This sign means 'is the same as'. It's like a balance. ⚖️In 3 + 1 = 4, the equal sign means 3 + 1 is the same amount as 4. SumThe sum is the total you get when you add numbers together.In 7 + 3 = 10, the number 10 is the sum. True ✅True means the sentence is correct. Both sides of the = are the same.The sentence 2 + 2 = 4 is true because 2 + 2 is the same as 4. False ❌False means the sentence is incorrect. Both sides of the = are not the same.The sentence 2 + 2 = 5 is fal...

The Balance Rule Left Side = Right Side Think of the equal sign as the middle of a seesaw. For a sentence to be true, both sides must be balanced and have the same value. The Parts and Whole Rule Part + Part = Whole When we add, we put two small groups (the parts) together to make one big group (the whole). We check if the parts really do make that whole.