Counting by tens | Counting | Early Math | Khan Academy

Summary

In this engaging video by Khan Academy, viewers learn the concept of counting by tens. The lesson begins with a simple exercise to identify the missing number in a sequence and highlights the pattern of counting in tens: 10, 20, 30, and so on. This method is further clarified through visual aids, such as the use of ten frames, which help illustrate how groups of ten add up to larger numbers like 20 or 40. The video combines numerical sequences with interactive elements, reinforcing the connection between numbers and counting by tens in a fun and educational way.

Highlights

• The video teaches counting by tens using an example sequence. 🎯
• Ten frames serve as a tool for visualizing groups of ten, helping to understand numbers like 20 or 40. 🔢
• The lesson includes interactive examples to reinforce learning through participation. 🤓

Key Takeaways

• Counting by tens is simple: just add 10 to the previous number. 🎉
• Ten frames are a great visual way to see groups of ten objects. 👀
• Missing number activities can help reinforce counting skills. 🧠
• Using visuals like frames helps in understanding the concept better. 📊
• Interactive examples make learning fun and engaging! 🎮

Overview

Khan Academy's video on counting by tens offers a playful yet informative lesson on one of the fundamental concepts of early math. The host utilizes a straightforward sequence (10, 20, 30, etc.) to demonstrate how easy it is to count by tens, encouraging viewers to find the missing number in a given sequence.

The use of ten frames—a block containing 10 objects—serves as a practical visual aid. Viewers are shown how two groups of ten make twenty, and how four groups make forty, with each frame clearly displaying this progression. This visual method aids in solidifying the concept for young learners.

Not only does the video provide clear and simple explanations, but it also incorporates interactive questions to engage the audience actively. Such an approach makes the learning process both enjoyable and effective, allowing students to grasp the concept of counting by tens with confidence.

Chapters

• 00:00 - 00:30: Introduction and Counting by Tens Example This chapter introduces counting by tens using an example where a sequence is missing a number. The transcript walks through counting by tens from 10 to 100 and highlights how 30 is missing from the sequence (10, 20, __, 40, 50, 60, 70, 80, 90, 100). The correct answer is identified as missing 30 from the sequence, showing the completed count as 10, 20, 30, 40, 50, 60, 70, 80, 90, 100.
• 00:30 - 01:00: Understanding 10 Frames The chapter 'Understanding 10 Frames' explains the concept of 10 frames, which are visual tools used to represent numbers up to 10. A 10 frame consists of a block with 10 slots, often filled with objects or dots, representing the numbers from 1 to 10. In the example given, the question 'Which 10 frames show 20?' is addressed. The answer is determined by recognizing that 20 is composed of two groups of 10, therefore, requiring two 10 frames to visually represent the number 20. The explanation helps learners grasp the concept of grouping in tens and how it visually translates using 10 frames.
• 01:00 - 01:30: More Examples with 10 Frames The chapter 'More Examples with 10 Frames' discusses a problem that involves evaluating different choices of numerical frames. The choices given are: choice B with frames 10, 20, 30, 40, and choice C with frames 10, 20, 30. The task is to drag 10 frames into a box to make a total of 40. The process involves incremental additions of 10: starting at 10, then 20, increasing to 30, and finally reaching 40. This solution validates the logic of choice A, and successfully completes the task in a step-by-step manner.

Counting by tens | Counting | Early Math | Khan Academy Transcription

• 00:00 - 00:30 so we are told let's count by tens and we go 10 20 blank 40 50 60 70 80 90 000. what number did we miss pause the video what number did we miss right over here well if we're counting by tens we would go 10 20 30. 40 50 60 70 80 90 100 so we're missing 30. so which choice right over here has 30 well if we scroll down a little bit we see right there that is
• 00:30 - 01:00 our choice let's do another example so here we are asked which 10 frames show 20 and a 10 frame is just a fancy word for one of these blocks of these frames that have 10 objects in it you can see it right over here 1 2 3 4 5 6 7 8 9 10. so which of these 10 frames show 20. well 20 is two groups of 10. so this is 10 and then 20. so that's 20 right over
• 01:00 - 01:30 there choice b is 10 20 30 40. choice c is 10 20 30. so we could feel good about choice a here we're told drag the 10 frames into the box to make 40. so let's see here this is 10 right over there then we get another 10 gets us to 20 then another 10 gets us to 30 and then finally another 10 gets us to 40. 10 20 30 40. we're done