Mathematics Grade 1 15 min

Ways to make a number - addition sentences

Ways to make a number - addition sentences

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Introduction & Learning Objectives

Learning Objectives Find different pairs of numbers that add up to a given number (up to 10). Write a complete addition sentence for each pair. Use objects or drawings to show ways to make a number. Explain that a number can be made in many ways. Systematically find all addition pairs for a number (e.g., starting with 0, then 1, etc.). Let's make the number 5! How many ways can you show 5 fingers using two hands? 🖐️ Today, we will be number detectives! 🕵️ We will find all the secret pairs of numbers that make one bigger number. We will write them down as addition sentences. Real-World Applications Sharing 6 cookies with a friend 🍪 Putting 8 toys on two different shelves 🧸 Finding two coins that make 10 cents 🪙 Counting 7 red and blue cars in a parking lot 🚗...
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Key Concepts & Vocabulary

TermDefinitionExample Addition SentenceA math sentence that uses a plus sign (+) and an equals sign (=) to show adding.3 + 2 = 5 is an addition sentence. It reads 'three plus two equals five'. AddendsThe numbers you are adding together. They are the 'parts'.In 4 + 1 = 5, the numbers 4 and 1 are the addends. 🍎🍎🍎🍎 + 🍎 SumThe answer you get when you add. It is the 'total' or 'whole'.In 4 + 1 = 5, the number 5 is the sum. 🍓🍓🍓🍓🍓 Plus Sign (+)This little sign tells us to add numbers together. It means 'and' or 'add'.We use it like this: 2 + 3. It means 2 and 3 more. Equals Sign (=)This sign means 'is the same as'. It shows that both sides have the same value.In 3 + 4 = 7, it means 3 + 4 is the same amount as 7. 😊
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Core Formulas

The Turn-Around Rule a + b = b + a You can switch the addends, and the sum stays the same! It's like flipping pancakes. 🥞 The Zero Rule a + 0 = a Adding zero to any number doesn't change it. The number stays the same. ✨

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Sample Practice Questions

Challenging
Look at the pattern: 12=10+2, 13=10+3, 14=10+4. What addition sentence for 15 would come next in the pattern?
A.15 = 10 + 5
B.15 = 9 + 6
C.15 = 8 + 7
D.15 = 14 + 1
Challenging
Two numbers add up to 18. Both numbers are the exact same. What is the addition sentence?
A.10 + 8 = 18
B.9 + 9 = 18
C.18 + 0 = 18
D.1 + 17 = 18
Challenging
Use the numbers 4, 5, and 9. Which addition sentence can you make where the answer is one of the other numbers?
A.9 + 5 = 14
B.9 + 4 = 13
C.5 + 9 = 14
D.4 + 5 = 9

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