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Welcome to Addition! – Greet the class and set a positive tone – Introduce today’s math concept – We’re learning to add bigger numbers today! – Explain using models for addition – Models like blocks or drawings help us see the numbers – Practice adding a two-digit number and a multiple of ten – Example: 23 + 30. How many do we have now? | Begin the class with a warm greeting to create an inviting atmosphere. Introduce the concept of addition, emphasizing that today’s focus will be on adding two-digit numbers with multiples of ten. Explain that models, such as base-ten blocks or number lines, can be used to visually represent the numbers and make it easier to understand the addition process. Engage the students with hands-on practice, using physical models or illustrations on the board to demonstrate how to combine a two-digit number with a multiple of ten. For example, show how to add 23 and 30 by lining up the tens and ones. Encourage the students to participate and try their own examples. The goal is to build their confidence in adding larger numbers using visual aids.

Understanding Two-Digit Numbers – What are two-digit numbers? – Examples: 12, 34, 56 – Numbers like 12 have two digits, 1 and 2 – Tens and ones places – The first digit is the tens place, the second is the ones place – Adding multiples of ten – 30 (a multiple of ten) + 22 = 52 | This slide introduces first graders to the concept of two-digit numbers, which are the building blocks for understanding place value and addition. Start by explaining that two-digit numbers are made up of tens and ones. Use visual aids like blocks or drawings to show the tens and ones places. Provide clear examples of two-digit numbers and demonstrate how to add a multiple of ten to a two-digit number using models or manipulatives. For instance, show 30 as three groups of ten blocks and 22 as two groups of ten blocks and two single blocks, then combine them to illustrate the addition. Encourage students to practice with different numbers and to visualize the place value concept.

Adding Multiples of Ten – Understanding multiples of ten – Multiples of ten are numbers like 10, 20, 30… – Examples: 10, 20, 30, 40… – These are easy to spot because they all end with a zero! – Recognizing the zero at the end – Practice adding with tens – Let’s add 10 to numbers like 25, 34, and 46! | This slide introduces first graders to the concept of multiples of ten, which is foundational for understanding place value and addition within the base-ten number system. Start by explaining that multiples of ten are simply the numbers you get when you count by tens. Highlight that these numbers always end with a zero, making them easy to recognize. Use visual aids like number lines or base-ten blocks to show this concept. Then, move on to simple addition problems involving a multiple of ten and a two-digit number, demonstrating how the tens place increases. Encourage students to use physical manipulatives or drawings to represent these problems and solidify their understanding.

Adding with Base-Ten Blocks – Use objects to help us add – Base-ten blocks represent numbers – Ones are single blocks, tens are rods of 10 blocks – Add a two-digit number and a multiple of ten – Example: 23 (2 rods, 3 blocks) + 40 (4 rods) – Practice with base-ten blocks – Let’s try adding 23 and 40 using the blocks! | This slide introduces the concept of using physical models, specifically base-ten blocks, to help first graders visualize addition. Base-ten blocks are a great way to represent numbers, with single blocks for ones and rods of 10 blocks for tens. Show how to add a two-digit number and a multiple of ten by placing the corresponding number of rods and blocks together. For example, to add 23 and 40, combine 2 rods and 3 blocks with 4 rods to see the result. Encourage students to practice with actual base-ten blocks or drawings of them to solidify their understanding of addition.

Let’s Practice Adding! – Make 23 with base-ten blocks – Use 2 ten-blocks and 3 one-blocks to represent 23 – Add 3 ten-blocks for 30 – Add three more ten-blocks to the 2 you have – Count all ten-blocks and one-blocks – Now you have 5 ten-blocks and 3 one-blocks – Find the total sum – Add the blocks together to find 23 + 30 | This slide is designed to help first graders visualize addition with the help of base-ten blocks. By creating a physical representation of the number 23 using two ten-blocks and three one-blocks, students can easily see what happens when they add another 30 (represented by three ten-blocks). Counting all the blocks together allows them to find the total in a tangible way. This exercise not only helps with understanding addition but also reinforces the concept of place value. Encourage students to arrange their blocks neatly and count carefully. After the activity, discuss with the class how many ten-blocks and one-blocks they have in total and what the final sum is.

Adding Multiples of Ten – Add without models – Tens place changes – When adding 10s, only the number in the tens place increases. – Example: 23 + 30 – 23 has 2 tens. 30 is 3 tens. 2 tens + 3 tens = 5 tens. – Practice on paper – Try adding 23 and 30. Write it down and see the change in tens place. | This slide introduces students to the concept of adding a multiple of ten to a two-digit number without using physical models. Emphasize that when we add a multiple of ten, only the tens digit is affected. Use the example 23 + 30 to illustrate this point. The number 23 has two tens, and we are adding three more tens (from 30), which gives us five tens in total, resulting in 53. Encourage students to practice this method on paper with various examples to reinforce the concept. Provide additional practice problems for students to solve independently, such as 45 + 20, 56 + 40, and 67 + 10.

Class Activity: Addition Race! – Pair up for base-ten block addition – Each pair gets a unique problem – Solve the addition problem together – Share your solution with the class | This activity is designed to be interactive and hands-on, using base-ten blocks to visually represent and solve addition problems involving multiples of ten and two-digit numbers. Before starting, demonstrate how to use base-ten blocks for addition. Split the class into pairs, ensuring each pair has a set of base-ten blocks. Distribute different addition problems to each pair. Circulate the room to assist pairs as needed. After solving, each pair will present their problem and solution to the class, explaining how they used the blocks to reach their answer. This will reinforce their understanding and allow them to learn from each other. Possible problems could be 20+35, 40+17, 10+66, etc. Encourage students to discuss their strategies with their partner and the class.

Review: Adding Multiples of Ten – Recap of today’s lesson – We learned to add a multiple of ten to a two-digit number. – Open floor for questions – Practice is key to mastery – Keep practicing with examples like 30 + 45. – Homework: Addition worksheet – Complete the provided worksheet for more practice. | This slide aims to consolidate the day’s learning by reviewing the concept of adding a multiple of ten to a two-digit number. Encourage students to ask any questions they might have to clarify their understanding. Emphasize the importance of practice in mastering this skill and provide a worksheet for additional practice at home. The worksheet should include a variety of problems that require students to apply the concept they’ve learned. During the next class, review the homework to address any common issues and celebrate successes.