Number Talk in 3rd Grade

Summary

The video script captures a lively math class where students engage in solving simple arithmetic problems using various strategies. The teacher encourages different approaches, such as mental math, counting up, and using a number line, to find the answers to problems like 78 minus 5 and 75 minus 7. Students share their methods, demonstrating a range of techniques from straightforward subtraction to more creative problem-solving. The interactive and exploratory nature of the lesson aims to deepen understanding and encourage mathematical thinking.

Takeaways

• 😀 The transcript involves a classroom discussion on solving simple arithmetic problems using various strategies.
• 📚 The first problem presented is 5 - 8 = 3, and the students are encouraged to find different ways to solve it.
• 🤔 One student solved it by subtracting 5 from 75 and then flipping the result, which is a creative approach to the problem.
• 📉 Another student used a rounding method, rounding 78 to 80 and then adding 2 to reach 82, before subtracting to find the result.
• 🔢 The discussion includes breaking down numbers into place value, which helps in understanding the arithmetic process.
• 🎓 The teacher emphasizes the importance of understanding different strategies for solving arithmetic problems.
• 📈 A number line strategy is mentioned, where students count up from a known number to find the answer.
• 📝 The transcript highlights the counting up strategy, where students count from 77 to 78 to reach the next number.
• 🤓 Some students used mental math to quickly solve the problems, showing a good grasp of basic arithmetic.
• 📊 A student shared a strategy of adding 5 and 8 to reach 13, demonstrating the use of addition in problem-solving.
• 👥 The teacher encourages students to share their methods with a neighbor, promoting peer learning and discussion.

Q & A

What is the first problem presented in the script?

The first problem is a simple subtraction task where the participants are asked to calculate 5 foot 8 minus 5 and 7 minus 7.

What is the result of 5 foot 8 minus 5 in the script?

The result of 5 foot 8 minus 5 is 3, as the 'foot' unit is not considered in the calculation.

How does the script suggest a different approach to the subtraction problem?

The script suggests using a number line strategy, rounding numbers to the nearest tens, and then performing the subtraction.

What is the alternative method mentioned for finding the difference between 75 and 78?

The alternative method involves rounding 78 to 80, then subtracting 80 from 75, and adjusting the result by the difference between the rounded and actual numbers.

What is the significance of the number 82 mentioned in the script?

The number 82 is mentioned as a point in the alternative subtraction method, where the participant rounds 78 to 80 and then adds 2 to reach 82.

How does the script describe the counting up strategy for solving the problem involving 77 and 78?

The counting up strategy involves starting at 77 and counting up to 78, recognizing that one more than 77 is 78.

What is the place value strategy mentioned in the script?

The place value strategy involves breaking down the numbers into their place values and performing calculations based on those individual place values.

What is the result of 65 plus 5 plus 8 in the script?

The result of 65 plus 5 plus 8 is 78, as the participant uses a combination of addition to reach the final number.

How does the script suggest using a number line for the problem involving 70 and 8?

The script suggests using a number line to visualize the jump from 70 to 78 by adding 8, which is a more visual and intuitive approach to the problem.

What is the final problem presented in the script involving the numbers 70, 60, and 8?

The final problem is to find the result of 70 minus 60 and then adding 8, which is a combination of subtraction and addition.

What is the outcome of the final problem in the script?

The outcome of the final problem is 13, achieved by first subtracting 60 from 70 to get 10, and then adding 8 to reach 13.