40 => 2³ × 5
80 => 2⁴ × 5
100 => 2² × 5²
2² × 5
2 × 2 × 5
4 × 5
20
2⁴ × 5²
2 × 2 × 2 × 2 × 5 × 5
4 × 4 × 25
16 × 25
400
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40 => 2³ × 5
80 => 2⁴ × 5
100 => 2² × 5²
2² × 5
2 × 2 × 5
4 × 5
20
2⁴ × 5²
2 × 2 × 2 × 2 × 5 × 5
4 × 4 × 25
16 × 25
400