# Which number is the largest? 7.2 × 10^{-6}, 3.09 × 10^{3}, 2.04 × 10^{4}, 5 × 10^{3}

**Solution:**

Given, the numbers are 7.2 × 10^{-6}, 3.09 × 10^{3}, 2.04 × 10^{4}, 5 × 10^{3}

All numbers can be written in standard form as

(1) 7.2 × 10^{-6} = (72 / 10) × (1 / 1000000)

= 0.0000072

(2) 3.09 × 10^{3} = (309 / 100) × (1000)

= 3090

(3) 2.04 × 10^{4} = (204 / 100) × (10000)

= 20400

(4) 5 × 10^{3} = 5 × (1000)

= 5000

The decimal number is the least number among all.

The five-digit number is the greatest number among all.

Therefore, the largest number is 2.04 × 10^{4}.

## Which number is the largest? 7.2 × 10^{-6}, 3.09 × 10^{3}, 2.04 × 10^{4}, 5 × 10^{3}

**Summary:**

The largest number among 7.2 × 10^{-6}, 3.09 × 10^{3}, 2.04 × 10^{4}, 5 × 10^{3} is 2.04 × 10^{4}.

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