Making 5 | Basic addition and subtraction | Early Math | Khan Academy

Summary

In this engaging early math session from Khan Academy, the video explores the fundamental concept of making five through basic addition and subtraction. It starts with finding the missing number in various equations to make the sum five, using simple diagrams involving different shapes and colors. For example, it demonstrates that three plus two equals five, as well as two plus three, highlighting the commutative property of addition. By using visual aids like circles, boxes, and smiley faces, the video encourages active participation by prompting viewers to pause and solve the problems themselves. It's an exciting way for children to grasp the principles of filling and missing parts, making foundational math concepts clear and enjoyable.

Highlights

• Khan Academy's video teaches making five using basic addition and subtraction! 🖐️
• Three plus two equals five, and two plus three too, showing the commutative property. 🔄
• Four plus one and one plus four both are equal to five, proving math symmetry! 📏
• Fun visuals using colors and shapes make learning math exciting for kids. 🎨
• Encouraging kids to pause and think helps reinforce math concepts. 💡

Key Takeaways

• Learning to make five using addition and subtraction is fun and simple! 🎉
• Visual aids like circles and smiley faces make math engaging for kids. 🤩
• Pausing the video to solve problems enhances learning and understanding. 🛑
• Understanding the commutative property: 3 + 2 is the same as 2 + 3! 🔄
• Math can be colorful and interactive with different shapes and colors. 🌈

Overview

In this fun and interactive video by Khan Academy, the basics of making five through simple addition and subtraction are explored. Using charming visuals involving colorful circles, boxes, and smiley faces, the video presents a delightful way for kids to understand and master the concept of counting and filling spaces.

The video begins with problems like three plus something equals five. It uses diagrams to show that simply adding two more completes the set to five. Similarly, it flips the equation, demonstrating how the mystery number concept works, reinforcing the mathematical property that addition is commutative.

Viewers are encouraged to pause and attempt solving these puzzles, making the learning process engaging and participative. This method not only solidifies the understanding of basic math concepts but also makes it a fun and memorable experience for young learners. Math has never been this colorful and enjoyable!

Chapters

• 00:00 - 00:30: Introduction to Making Five The chapter introduces the concept of different ways to make the number five through the use of basic addition. It begins with the equation 'three plus something equals five' and uses a visual diagram with circles and boxes to illustrate this concept. The voiceover emphasizes understanding the unknown number that, when added to three, results in five.
• 00:30 - 01:00: Three Plus Mystery Box The chapter titled 'Three Plus Mystery Box' revolves around a mathematical exercise where the task is to determine how many circles are needed to fill five boxes. Initially, three boxes are filled with blue circles, and the challenge is to figure out the additional circles required. The resolution is simple: adding two more circles, depicted in a purple or pink color, completes the task. This demonstrates the basic arithmetic of 3 + 2 equaling 5.
• 01:00 - 02:00: Two Plus Mystery Box In the chapter "Two Plus Mystery Box," a mathematical problem is explored where the reader must determine a mystery number in an equation. The scenario begins with a known equation: three plus two equals five. The chapter then presents a similar problem: two plus a mystery number equals five. A visual representation is provided with five boxes, two already filled with stars, to help solve the equation and find out how many more stars are needed to fill all five boxes, thereby determining the mystery number.
• 02:00 - 03:00: Four Plus Mystery Box The chapter titled 'Four Plus Mystery Box' discusses solving the equation 'two plus what equals five.' It encourages readers to think about the problem before providing a solution. The explanation uses the analogy of filling boxes with stars, where three more boxes need to be filled to reach a total of five, illustrating that two plus three equals five.
• 03:00 - 04:00: One Plus Mystery Box In this chapter, the concept of addition is explored using a mystery box approach. The narrator begins by discussing simple equations such as two plus three equals five, where the mystery number is identified as three. The chapter proceeds to introduce another example with four plus a mystery number equaling five, prompting the reader to determine how many items are needed to complete the total of five. This interactive approach encourages problem-solving and reinforces basic arithmetic concepts.
• 04:00 - 04:30: Review and Observations The chapter titled 'Review and Observations' presents a mathematical reasoning exercise. It begins with a scenario where there is exactly one box that requires filling or needs an additional box to be added to four existing boxes. The chapter emphasizes simple arithmetic by illustrating that four plus one equals five. It then poses a related question by reversing the scenario: starting with five boxes, where only one is filled, and asking how many more smiley faces (symbolizing items or units) need to be added to fill all the boxes completely. This context suggests an exercise to reinforce the understanding of basic addition and the concept of filling or completing sets. Through these exercises, the chapter encourages readers to observe mathematical patterns and relationships involved in this process.

Making 5 | Basic addition and subtraction | Early Math | Khan Academy Transcription

• 00:00 - 00:30 Voiceover: What I want to do in this video is think about the different ways to make five. What do I mean about that? Right over here we have three plus something, so there's some unknown number right over here. Three plus something is going to be equal to five. In this diagram we have three circles here that represents the three and then we have five boxes. One, two, three, four, five.
• 00:30 - 01:00 How many more circles do we need in order to fill up all the five boxes? We've clearly already filled three. Well, let's think about it. We just have to add one and two circles. Now we have a total of five. Three blue ones and two of this purple color or I guess this pink color. We see that three plus two is equal to five.
• 01:00 - 01:30 That mystery number here, that blank is two. Three plus two is equal to five. Now over here we have two plus a mystery number is equal to five again. Once again, we have five spaces and two of them are filled in with this kind of purple, pink stars. How many more do we have to fill in in order to fill in all five boxes,
• 01:30 - 02:00 two plus what is equal to five. I encourage you to pause the video and think about it. I'm assuming you've had a go at it. Let's think about how many more of this boxes we need to fill in, in order to fill in all five of them. We need to fill in one, two, and three of the boxes in order to fill out all five. Now we have five stars. We have two of the pink ones and we have three of the blue ones.
• 02:00 - 02:30 We can say that two plus three, the mystery number here is three. Two plus three is equal to five. Let's do a few more of this. Here I have four plus some mystery number is equal to five. I filled out four of the five boxes, how many more do I need to fill in in order to have five things, in order to have all five boxes filled out. Well we see very clearly here
• 02:30 - 03:00 that there is exactly one box that we need to fill in or one box that we need to add to the other four. We see that four plus one is equal to five. Now let's go the other way. We have the five boxes, only one of them is filled in. How many more of these smiley faces do we need to add, in order to fill in all the boxes?
• 03:00 - 03:30 Or another way of thinking about it, we have one, how many more do we need to add to one to get to five? Like always, I encourage you to pause the video and think about it on your own. Well, let's see, we can add one, we can add two, we can add three, and four yellow smiley faces. We could say one, one we have one white smiley face
• 03:30 - 04:00 plus one, two, three, four yellow smiley faces is equal to five. You see a pattern here. Let's start at the beginning. Three plus two is equal to five, and two plus three is equal to five. When you had three filled in, you needed two more to get to five. When you had two filled in, you needed three more to get to five. Notice three plus two, two plus three. Same thing over here, four plus one is equal to five,
• 04:00 - 04:30 one plus four is equal to five.