Using Subtraction to Find Missing Numbers

The video tutorial explains how to determine the number of children who voted for strawberry ice cream using a table of known values for other flavors. The instructor demonstrates two methods: adding known values and subtracting from the total. The preferred method involves step-by-step subtraction, ensuring accuracy and understanding of the process. The tutorial emphasizes the importance of showing work to earn full marks.

What is the total number of children who voted for an ice cream flavor?

• 38

• 87

• 402

• 154

Which method involves adding up all known values to find the number of children who voted for strawberry?

• Multiplication method

• Addition method

• Subtraction method

• Division method

What is the first step in the subtraction method to find the number of children who voted for strawberry?

• Subtract 87 from 402

• Add all known values

• Subtract 38 from 402

• Subtract 154 from 402

When subtracting 154 from 402, what is the first borrowing step?

• Borrow from the tens column

• Borrow from the hundreds column

• Borrow from the ones column

• No borrowing needed

After subtracting chocolate and vanilla votes, what is the next step?

• Subtract mint votes

• Add all votes

• Subtract strawberry votes

• Subtract total votes

What is the final number of children who voted for strawberry?

• 87

• 154

• 123

• 38

Why is it important to show your method in this problem?

• To get partial credit

• To confuse the teacher

• To make the problem harder

• To ensure accuracy and full marks