Understanding Singapore Math: Cookie Problem

The video tutorial covers a Singapore math problem involving subtraction and regrouping. The problem is about calculating the number of cookies sold by Mary, who initially made 686 cookies and had 298 left. The instructor uses visual aids like bars to represent the problem and explains the subtraction process in detail, including borrowing and regrouping. The tutorial aims to provide a clear understanding of subtraction with three-digit numbers, emphasizing the intuition behind the process.

What is the total number of cookies Mary initially made?

• 388

• 686

• 1000

• 298

Tags

CCSS.2.OA.A.1

How many cookies were left after Mary sold some?

• 686

• 388

• 298

• 100

Tags

CCSS.2.OA.A.1

What does the bar model represent in the problem?

• The number of cookies eaten

• The number of cookies sold

• The number of cookies left

• The total number of cookies made

Tags

CCSS.2.OA.C.4

What mathematical operation is used to find out how many cookies Mary sold?

• Addition

• Multiplication

• Division

• Subtraction

Tags

CCSS.4.OA.A.3

What is the first step in the subtraction process explained in the video?

• Divide 686 by 298

• Add 298 to 686

• Multiply 298 by 686

• Subtract 298 from 686

Tags

CCSS.7.NS.A.1C

What is the purpose of borrowing or regrouping in subtraction?

• To multiply numbers

• To handle cases where a digit in the minuend is smaller than the corresponding digit in the subtrahend

• To simplify addition

• To make numbers larger

Tags

CCSS.2.NBT.B.7

How many ones are there after borrowing from the tens place?

• 8

• 16

• 10

• 6

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

What is the final result of the subtraction 686 - 298?

• 298

• 100

• 686

• 388

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

How many hundreds are left after borrowing in the subtraction process?

• 3

• 5

• 6

• 2

Tags

CCSS.4.NBT.B.4

What does the final verification step confirm about the number of cookies sold?

• Mary sold 388 cookies

• Mary sold 686 cookies

• Mary sold 298 cookies

• Mary sold 100 cookies

Tags

CCSS.4.NBT.B.4