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Adding and Subtracting Multiples of Ten – Learn to add multiples of ten – Adding 10 to numbers like 20, 30, 40 – Learn to subtract multiples of ten – Subtracting 10 from numbers like 90, 80, 70 – What are multiples of ten? – Numbers like 10, 20, 30 are multiples of ten – Practice with examples – Examples: 30+10=40, 60-10=50 | Welcome students to the math class and introduce them to the concept of adding and subtracting multiples of ten. Explain that multiples of ten are numbers that can be divided by ten without leaving a remainder. Use visual aids like number lines or counters to help students understand the concept of adding or subtracting ten. Provide simple examples and encourage students to think of multiples of ten as ‘friendly numbers’ that make adding and subtracting easier. Practice with class activities where students can apply what they’ve learned by solving problems involving multiples of ten.

Understanding Multiples of Ten – What are multiples of ten? – Numbers like 10, 20, 30, etc. – Recognizing the pattern – They always end with a zero – Counting by tens – Like 10, 20, 30, we add 10 each time – Practice with examples – Let’s try 10+10, 20+10, 30-10 together | This slide introduces the concept of multiples of ten to first graders. Begin by explaining that multiples of ten are numbers that can be counted using our ten fingers, which makes them easy to remember. Emphasize the pattern that all multiples of ten end with a zero, which is a key observation for young learners. Engage the class in counting by tens together to reinforce the concept. Use simple addition and subtraction examples on the board to demonstrate how to add or subtract ten from these numbers. Encourage students to use their fingers if needed to count in tens and to visualize the concept. The goal is to make them comfortable with the idea of ‘ten’ as a building block for larger numbers.

Adding Multiples of Ten – Adding groups of ten – Think of it as adding groups of ten apples – Example: 10 + 20 – What do we get if we add 10 apples to 20 apples? – Count by tens to solve – Let’s count: 10, 20, 30! That’s our answer! – Practice with different numbers | This slide introduces first graders to the concept of adding multiples of ten. Start by explaining that when we add multiples of ten, we’re essentially adding groups of ten items together. Use the example provided (10 + 20) to illustrate this point. Encourage the students to count aloud by tens to find the answer, reinforcing the concept of skip counting. After going through the example, engage the students in practicing with different numbers, such as 30 + 40, 20 + 60, etc. Make sure to use visual aids like counting blocks or images of groups of ten objects to help them visualize the process. The goal is to make them comfortable with the idea of adding tens and understanding the pattern in the numbers.

Subtracting Multiples of Ten – Understanding subtraction of tens – Subtracting tens means taking away groups of 10. – Example: 30 – 10 equals what? – 30 minus 10 leaves us with 20. – Counting backward by tens – Just like counting down: 30, 20, 10, 0! | This slide introduces the concept of subtracting multiples of ten, which is a foundational skill in first-grade mathematics. Start by explaining that when we subtract multiples of ten, we are taking away groups of ten. Use visual aids like blocks or counters grouped in tens to help students visualize the process. Show the example on the slide and solve it together, demonstrating how to count backward by tens. Encourage students to use their fingers or manipulatives to count backward from 30 in tens to reinforce the concept. Make sure to check for understanding and correct any misconceptions before moving on to practice problems.

Let’s Practice Together: Adding & Subtracting Multiples of Ten – Solve 20 + 10 together – What do we get when we add 10 to 20? – Solve 40 – 20 together – If we take away 20 from 40, what’s left? – Counting by tens is key – Practice makes perfect | This slide is designed for an interactive class activity where students will practice adding and subtracting multiples of ten. Start by demonstrating the first problem on the board, guiding the students to understand that adding 10 to 20 results in 30. For the subtraction problem, show that taking away 20 from 40 leaves us with 20. Emphasize the concept of counting by tens to make these problems easier to solve. Encourage students to use their fingers or visual aids if necessary. The goal is to build their confidence in working with multiples of ten through repetition and practice. Prepare to offer praise and gentle corrections as needed. For variety, consider having students come up to the board to solve problems or work in pairs.

Activity Time: Group Counting Fun! – Form small groups for counting – Use number cards to add and subtract – Add or subtract multiples of ten using cards – Each group presents their answers – Practice teamwork and presentation skills – Get ready for a fun numbers game! | This activity is designed to encourage collaborative learning and hands-on practice with adding and subtracting multiples of ten. Divide the class into small groups and provide each with a set of number cards. Instruct them to create different combinations of adding and subtracting multiples of ten. Afterward, each group will present their findings to the class, allowing students to demonstrate their understanding and ability to work together. As a teacher, facilitate the activity by guiding students who may struggle and ensure that each group gets a chance to participate. Possible variations of the activity could include using physical objects to represent the numbers, incorporating a timed challenge, or having students create word problems based on their number card combinations.

Fantastic Counting by Tens! – Celebrate adding & subtracting by tens – Keep practicing counting in tens – Counting by tens helps with quick addition & subtraction – Everyone earns a star today – Remember, practice makes perfect! | This slide is meant to congratulate the students on their hard work during the lesson on adding and subtracting multiples of ten. It’s important to end the lesson on a positive note, reinforcing the value of practice and acknowledging their efforts. The star is a tangible reward for their focus and participation, which can be motivating for first graders. Encourage them to continue practicing at home by counting objects in groups of ten or playing counting games. Remind them that mastering these skills is a step-by-step process, and each practice session builds their confidence and ability in math.

Class Activity: Number Line Hopscotch – Play Number Line Hopscotch outside – Hop on multiples of ten – Multiples of ten: 10, 20, 30, 40, etc. – Add or subtract with hops – Example: 30 + 10, start on 30 and hop to 40 – Reinforce multiples of ten – Helps visualize and memorize the concept | This activity is designed to combine physical activity with learning. Set up a number line outside with multiples of ten clearly marked. Students will take turns hopping along the number line as they practice adding or subtracting multiples of ten. For instance, if the math problem is 20 + 30, the student will start at 20 and make three hops to land on 50. This kinesthetic approach helps students understand the concept of addition and subtraction with multiples of ten in a fun and engaging way. Prepare variations of the game for different skill levels, such as using larger numbers for advanced students or fewer hops for beginners.