📅 2026-06-02

Daily Math Challenge

📚 Science ⭐ Hard 🎓 Grade 6-8

A radioactive element has a half-life of 8 days. If you start with 640 grams, how much remains after 32 days?

Answer

40 grams

32 days = 4 half-lives (32 ÷ 8)

After 8 days: 640 ÷ 2 = 320 g

After 16 days: 320 ÷ 2 = 160 g

After 24 days: 160 ÷ 2 = 80 g

After 32 days: 80 ÷ 2 = 40 g

💡 Helpful Hints

• Calculate number of half-lives

• Divide by 2 for each half-life

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