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Welcome to Subtraction! – Subtraction: Finding what’s left – If you have 5 apples and eat 2, subtraction tells you 3 are left. – Making numbers with subtraction – Take 10 and subtract different numbers to make new ones! – The difference between numbers – Like, what’s 15 minus 7? It shows how much more one number is. – Understanding subtraction | This slide introduces the concept of subtraction to second graders. Begin by explaining that subtraction is a way to find out how many things are left after some are taken away. Use relatable examples, such as apples or toys, to illustrate this point. Encourage students to think of subtraction as a method to create new numbers by taking away from a starting number. Highlight that subtraction also shows the difference between two numbers, helping us understand how much more one number is compared to another. Ask the class what they think subtraction is to engage them and assess their prior knowledge. The goal is to ensure students grasp the basic idea of subtraction and how it can be applied to everyday situations.

Subtraction Review: Making Numbers – Reviewing 2-digit subtraction – Start with the larger number – We write the bigger number first, then subtract the smaller one. – Example: 15 – 7 – What is 15 minus 7? Let’s calculate together. – Find the difference – The difference is the answer we get after subtracting. | This slide is aimed at reviewing the concept of subtraction with second graders. Begin by reminding the students that in subtraction, the larger number must be placed on top. This is crucial for understanding how to subtract correctly. Use the example provided (15 – 7) to walk through the steps of subtraction. Emphasize the process of taking away the smaller number from the larger number and finding the difference. Encourage students to practice with similar examples and ensure they understand the concept of ‘difference’ as the result of subtraction. Provide additional examples if necessary and assist students who may need extra help with the concept.

Making Numbers with Subtraction – Subtraction makes numbers – Different ways to subtract – Example: Making 10 – 10 = 15 – 5 or 10 = 12 – 2 – Let’s practice together – We’ll try with different numbers in class | This slide introduces the concept that subtraction isn’t just for finding out how much is left; it’s also a way to create the same number using different number pairs. Start by explaining that subtraction is like finding the difference between two numbers. Show the example provided, demonstrating that 10 can be made by subtracting 5 from 15 or 2 from 12. Encourage the students to think of subtraction as a fun puzzle where they find different number pairs that subtract to the same result. During the class, engage the students with interactive practice, asking them to come up with their own subtraction equations that result in the same number. This will help solidify their understanding of subtraction and number relationships.

Subtraction Puzzles: Making Numbers! – Subtraction as a puzzle game – Each piece is a smaller number – Subtract pieces from 20 to get 10 – What if we take away 10 from 20? – Explore different combinations – Can we try 5+5 or 8+2 to subtract? | This slide introduces the concept of subtraction as a fun puzzle-solving activity. Encourage the students to think of subtraction as finding the right pieces (smaller numbers) that, when taken away from a bigger number, leave you with the desired result. For example, to make 10 from 20, we can subtract 10. Ask the students to think of subtraction as breaking the number 20 into two parts that add up to 20, and then taking one part away. This will help them understand that there are multiple ways to reach the answer using subtraction. Have them explore different combinations that can be subtracted from 20 to result in 10, such as 5+5 or 8+2, and discuss why these combinations work. This activity will help solidify their understanding of subtraction and number relationships.

Let’s Practice Subtraction Together! – I’ll give you a number to make – Find ways to make it by subtracting – Example: Making 8 using subtraction – Start with a number like 10, subtract 2 to make 8 – Work with a partner on this activity – Share your answers with the class after! | This slide is designed to engage students in a collaborative and interactive subtraction activity. Begin by explaining the concept of creating a number by subtracting from another number. Provide an example, such as starting with 10 and subtracting 2 to get 8. Encourage students to work with their partners to find various combinations that result in the given number using subtraction. Possible activities could include using manipulatives like counters or number lines, drawing pictures to represent the subtraction, or writing down number sentences. The goal is to help students understand that there are multiple ways to achieve the same result in subtraction and to reinforce their understanding of the concept.

Class Activity: Subtraction Creations – Choose any number as your target – Create 5 unique subtraction sentences – Use numbers less than 100 for practice – Each sentence should equal your target – Share your findings with the class – Explain how you got your answers | This activity is designed to help students understand that there are multiple ways to reach the same result using subtraction. Start by explaining that a subtraction sentence is just like a story problem, where we take away some parts to find out what’s left. Encourage students to think creatively and use different two-digit numbers to subtract from. They can use manipulatives like counters or draw pictures to help them visualize the subtraction. After they’ve created their sentences, have them present to the class to demonstrate their understanding and to practice their communication skills. Possible activities could include subtracting from 100, using even numbers only, or creating a subtraction story. This will also help them see the practical applications of subtraction in everyday life.

Great Work on Subtraction! – Proud of your subtraction skills – Complete Subtraction Creations worksheet – Worksheet has problems to make numbers using subtraction – Practice makes perfect – Keep exploring subtraction at home – Try making numbers with toys or snacks | This slide wraps up the lesson on making numbers using subtraction. Congratulate the students on their hard work and understanding of the concept. Assign the ‘Subtraction Creations’ worksheet for homework to reinforce today’s lesson. Encourage students to continue practicing at home, using everyday items to create subtraction problems. Remind them that consistent practice will help solidify their understanding of subtraction. For the next class, be prepared to review the homework worksheet and discuss any challenges the students faced.