Welcome to Subtraction: Using Ten to Subtract – Learn a new subtraction trick! – Using ten to subtract – If you have 12 – 3, think 10 – 3 first, then add the leftover 2 – Subtraction means taking away – Practice makes perfect – We’ll do fun activities to get better! | This slide introduces first graders to a helpful subtraction strategy that involves using the number ten as a reference point. The concept of subtraction as ‘taking away’ is reinforced, and the ‘use ten’ strategy is presented as a ‘trick’ to make subtraction easier and more fun. The slide sets the stage for interactive activities where students will practice this method with various numbers up to 20. Encourage the students to think of the number ten as a stepping stone when subtracting, which can simplify the process and help them solve problems more quickly. Provide plenty of examples and guide them through the process step by step, ensuring they understand how to break down a subtraction problem using ten.

Understanding Subtraction – Subtraction means taking away – It shows us how many are left – Example: 10 apples minus 2 – Start with 10 apples, eat 2, how many left? – How many apples are left? – We use subtraction to find the answer | This slide introduces the basic concept of subtraction to first graders. Subtraction is explained as the process of taking some amount away from a total, which helps us figure out the remaining quantity. Use a relatable example such as having a certain number of apples and eating some to illustrate the concept. Encourage students to visualize the action of removing items and counting what’s left. The example uses 10 as a base number to align with the ‘Use ten to subtract’ strategy, making it easier for students to grasp the concept of subtraction by relating it to a number they are familiar with.

Using Ten to Subtract – Why number 10 is special – 10 is a base number in our counting system, making it easier to work with. – Subtracting from 10 using fingers – We can use our 10 fingers to count down from 10 when we subtract. – Let’s solve an example together – Example: If we have 10 apples and eat 2, we count down to 8 apples left. | This slide introduces the concept of using the number 10 as a tool for subtraction, which is a fundamental strategy in first-grade mathematics. Emphasize the importance of the number 10 in our decimal system and how it relates to the physical world, such as counting on fingers. Demonstrate subtraction from 10 with a simple example, encouraging students to use their fingers to count. This tactile approach helps solidify the concept. Prepare to walk through the example as a class, and consider using real objects like counters or drawings to visualize the subtraction process. The goal is for students to become comfortable with subtracting single-digit numbers from 10.

Using Ten to Subtract – Start with 10 fingers – Put down 4 fingers – Count fingers still up – How many fingers are left up? – Discover the answer! – The number of fingers still up is the answer to 10 – 4 | This slide is designed to teach first graders the concept of subtraction using their fingers as a visual and tactile tool. By starting with all 10 fingers raised, students can easily subtract by putting down the number of fingers that corresponds to the number being subtracted from 10. After putting down 4 fingers, ask the students to count the number of fingers still raised. This interactive method helps solidify the concept of subtraction as ‘taking away’ from a whole. Encourage students to practice with different numbers subtracted from 10 to build their confidence and understanding of the concept. This activity can be done individually or in small groups to foster peer learning.

Practice Time: Subtracting with Blocks – Practice subtracting using blocks – Start with 10 blocks, then take some away – If we have 10 blocks and remove 3, how many are left? – Count the blocks left to find the answer – Subtracting is like taking away; use your blocks to see this – Let’s try with different numbers | This slide is designed for a hands-on activity where students will use physical blocks to practice subtraction. Start with 10 blocks for each student and instruct them to remove a certain number of blocks, then count the remaining blocks to find the answer. This visual and tactile method helps reinforce the concept of subtraction as ‘taking away.’ Encourage students to try with different numbers of blocks to subtract from 10, ensuring they understand the concept thoroughly. As they work, walk around the classroom to offer guidance and support. Prepare to assist students who may struggle with counting or conceptualizing subtraction.

Subtraction Game: Use Ten to Subtract – Let’s play a subtraction game – I’ll show a number, you subtract from 10 – Be quick! Shout the answer – Have fun and learn subtraction | This interactive game is designed to help first graders practice subtraction by using the number 10 as a reference point. Display a number to the class and prompt them to subtract that number from 10 as quickly as they can, encouraging them to shout out the answer. This activity not only reinforces their understanding of subtraction but also helps them to memorize the differences between 10 and other numbers up to 10. For the teacher: Prepare a list of numbers from 1 to 9 and display them one at a time. Encourage participation from all students and celebrate correct answers to build confidence. You can also use props or flashcards to make the game more engaging. Remember to provide positive feedback and support to students who may need extra help.

Class Activity: Subtraction with Snacks – Start with 10 snack pieces – Listen for the number to eat – Eat and count what’s left – How many are left after eating? – Understand subtraction with ten – Shows subtraction by removing parts | This interactive activity is designed to help students understand the concept of subtraction by using a tangible method. Each student will start with 10 pieces of a snack. When the teacher calls out a number, the student will eat that many pieces of their snack. Afterward, they will count how many pieces they have left, which will help them visually and physically understand how subtraction works. For example, if the teacher says ‘eat 3 pieces,’ and the student eats 3, they can then count that they have 7 pieces left, demonstrating that 10-3=7. This activity not only makes learning subtraction fun but also reinforces the concept of ‘using ten to subtract.’ Prepare alternative activities for students with dietary restrictions to ensure everyone can participate.

Review: Using Ten to Subtract – Using ten simplifies subtraction – Use fingers or objects for help – Counting down from 10, take away fingers or objects – Practice subtracting from ten – What’s 10 minus 3? Let’s count and see! – Helps with various math problems – Makes bigger subtraction problems easier | This slide is a review of the concept that using ten as a reference point can make subtraction easier for first graders. Emphasize that ten is a foundational number in our number system, and subtracting from it can be a helpful strategy. Encourage students to use their fingers or objects like blocks or counters to physically represent the subtraction process, which can enhance their understanding. Practice problems where students subtract from ten to reinforce the concept. Highlight how this strategy is not only useful for single subtraction problems but also serves as a building block for solving more complex math problems in the future. Provide several examples and encourage students to explain their thought process as they solve each problem.

Homework Challenge: Using Ten to Subtract – Take your subtraction worksheet home – Solve problems using the ‘Use Ten’ strategy – Subtract by making a group of ten first, then take away the rest – Remember to bring it back next class – We’ll review the worksheet together! – We’ll check answers and learn from mistakes | This homework is designed to reinforce the ‘Use Ten’ subtraction strategy that we’ve learned in class. Encourage the students to try to solve the subtraction problems by making groups of ten first, which simplifies the process. Remind them to bring their worksheets back so that we can go over the answers together and discuss any challenges they faced. This will help them understand the concept better and give them confidence in their subtraction skills. Prepare to offer additional support for students who may struggle with this concept and have alternative strategies ready to help them grasp the idea.