Math Problem Statement

Sachant que 1/3 = 0.3, démontre que 0.9 = 1.

Solution

The problem asks to demonstrate that 0.3×3=10.\overline{3} \times 3 = 1 given that 13=0.3\frac{1}{3} = 0.\overline{3}.

Solution:

  1. Understanding the repeating decimal: 0.3 means 0.333330.\overline{3} \text{ means } 0.33333\ldots This is a repeating decimal that represents 13\frac{1}{3}.

  2. Multiplying by 3: 0.3×3=(13)×30.\overline{3} \times 3 = \left(\frac{1}{3}\right) \times 3 Since 13×3=1\frac{1}{3} \times 3 = 1, we conclude that: 0.3×3=10.\overline{3} \times 3 = 1

Thus, the statement is correct, and 0.3×3=10.\overline{3} \times 3 = 1 is true.

Would you like further details or have any questions?

Here are some related questions:

  1. What is a repeating decimal, and how is it represented?
  2. How can you convert repeating decimals to fractions?
  3. Why does multiplying 13\frac{1}{3} by 3 yield exactly 1?
  4. How can you prove that 0.30.\overline{3} is equal to 13\frac{1}{3} using algebra?
  5. What other fractions have repeating decimal representations?

Tip: When working with repeating decimals, multiplying or dividing by numbers that relate to the repeating part can often help to simplify the expression or convert it to a fraction.

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Math Problem Analysis

Mathematical Concepts

Algebra
Repeating Decimals

Formulas

0.\overline{3} \times 3 = 1

Theorems

Equality of Repeating Decimals and Fractions

Suitable Grade Level

Grades 6-8