Chapter 2: Q7. (page 103)

Explain how you can use estimation to check that the answer of the expression $3.1 \cdot (- 6.8)$ is reasonable.

Short Answer

Expert verified

The value of the expression $3.1 \cdot (- 6.8)$ is $- 21.08$ which is reasonable.

Step by step solution

– Given information.

The given expression is:

$3.1 \cdot (- 6.8)$

– Write the concept.

Since the number $3.1 \approx 3$ and $- 6.8 \approx - 7$ .

So, use the expression $3 \cdot (- 7)$

– Evaluate the expression.

The expression $3 \cdot (- 7)$ becomes:

$3 \cdot (- 7) = - 21$

And the given expression $3.1 \cdot (- 6.8)$ is $- 21.08$ .

Therefore, the answer $- 21.08$ is reasonable.

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Explain how you can use estimation to check that the answer of the expression $3.1 \cdot (- 6.8)$ is reasonable.

Short Answer

Step by step solution

– Given information.

– Write the concept.

– Evaluate the expression.

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Explain how you can use estimation to check that the answer of the expression 3.1·-6.8is reasonable.

Short Answer

Step by step solution

– Given information.

– Write the concept.

– Evaluate the expression.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Math Textbooks

Pure Maths

Decision Maths

Logic and Functions

Theoretical and Mathematical Physics

Geometry

Discrete Mathematics

Study anywhere. Anytime. Across all devices.

Explain how you can use estimation to check that the answer of the expression $3.1 \cdot (- 6.8)$ is reasonable.