Understanding Subtraction with Manipulatives

The video tutorial demonstrates how to solve the subtraction problem 87 - 9 using manipulative counters. It explains the need for regrouping by breaking a ten into ones to facilitate the subtraction of nine ones. The process is shown step-by-step, highlighting the importance of understanding place value and regrouping in subtraction. The final result of the subtraction is confirmed to be 78.

What is the initial problem that needs to be solved?

• Calculate 87 - 9

• Add 87 and 9

• Multiply 87 by 9

• Divide 87 by 9

Why can't the teacher subtract 9 ones directly from 87?

• There are not enough tens

• The number is too small

• There are not enough ones

• The number is too large

What does the teacher do to solve the problem of not having enough ones?

• Subtracts a different number

• Breaks a ten into ones

• Adds more ones

• Uses a calculator

How many ones does the teacher have after breaking a ten?

• 9 ones

• 10 ones

• 7 ones

• 5 ones

What is the new structure of the number 87 after breaking a ten?

• 70 tens and 10 ones

• 70 tens and 17 ones

• 70 tens and 7 ones

• 80 tens and 7 ones

After removing nine ones, what is the final answer?

• 76

• 78

• 77

• 79

What is the purpose of using manipulative counters in this problem?

• To make the problem more complex

• To multiply numbers

• To add numbers more easily

• To visually demonstrate subtraction