Singapore Math: Grade 3a Unit 2 (part 2) | Summary and Q&A

TL;DR

Mary made 686 cookies, sold some, and had 298 left. The video explains how to find the number of cookies she sold through a Singapore Math method.

Key Insights

• 🤢 Singapore Math utilizes bar modeling to visually represent and solve mathematical problems.
• #️⃣ The problem involves finding the number of cookies sold by subtracting the number left from the total.
• 🌥️ The method of borrowing or regrouping is used to perform subtraction with larger numbers.
• 🆘 Understanding the intuition behind borrowing or regrouping helps in solving more complex subtraction problems.
• 🇸🇬 The problem showcases how Singapore Math can make complex math concepts more accessible and intuitive.
• 🧑‍🏫 The method taught in the video can be applied to subtraction problems with larger numbers.
• 🇸🇬 Singapore Math emphasizes a conceptual understanding of mathematical operations.

Transcript

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Questions & Answers

Q: How many cookies did Mary make?

Mary made a total of 686 cookies.

Q: How many cookies did Mary sell?

To find out how many cookies Mary sold, we need to subtract the number of cookies left from the total number of cookies made. So, 686 - 298 = 388. Mary sold 388 cookies.

Q: What method is used to solve this problem?

The video uses a Singapore Math method that involves drawing bars to represent the total number of cookies made, shading in the number of cookies sold, and calculating the difference between the total and the number left.

Q: How can the problem be viewed from a different perspective?

The problem can be viewed as starting with 686 cookies, selling 388 cookies, and ending up with 298 cookies.

Summary & Key Takeaways

• Mary made 686 cookies and sold some of them.

• She had 298 cookies left.

• The video demonstrates how to find the number of cookies she sold using Singapore Math.