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Understanding the Flawed Proof

Understanding the Flawed Proof

Assessment

Interactive Video

Mathematics

9th - 12th Grade

Practice Problem

Hard

CCSS
HSA-REI.B.4B, 6.EE.B.6, HSA.REI.A.1

Standards-aligned

Created by

Jackson Turner

FREE Resource

Standards-aligned

CCSS.HSA-REI.B.4B
,
CCSS.6.EE.B.6
,
CCSS.HSA.REI.A.1
The video presents a flawed mathematical proof that claims one equals two. It begins by assuming two equal real numbers, A and B, and proceeds through a series of algebraic manipulations, including multiplication, addition, subtraction, and factoring. The proof concludes with the incorrect statement that two equals one, highlighting a division by zero error as the flaw in the logic.

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5 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the initial assumption made in the proof?

A and B are different real numbers.

A and B are the same real number.

A is greater than B.

A is less than B.

Tags

CCSS.HSA-REI.B.4B

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What operation is performed after multiplying both sides by A?

Dividing both sides by A.

Adding A squared to both sides.

Multiplying both sides by B.

Subtracting A squared from both sides.

Tags

CCSS.HSA-REI.B.4B

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the result of factoring the left side of the equation?

A squared minus A B.

2A squared plus A B.

2A times the quantity A minus B.

A times the quantity A minus B.

Tags

CCSS.HSA.REI.A.1

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the incorrect conclusion reached in the proof?

A minus B equals zero.

Two equals one.

A squared equals A B.

A equals B.

Tags

CCSS.6.EE.B.6

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the flaw in the proof?

Division by zero.

Addition of unequal terms.

Incorrect multiplication.

Incorrect subtraction.

Tags

CCSS.6.EE.B.6

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