Exponential Growth & DecayATI TEAS 7 cheat sheet

Doubling and halving

8 key facts Reviewed Oct 2026

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Growth

Quantity multiplies by the same factor each period
Bacteria doubling, compound interest

Decay

Quantity is multiplied by a factor less than 1
Drug half-life, radioactive decay

Half-Life

After 1 half-life 50% remains
after 2, 25%
after 3, 12.5%

Recognizing

Equal ratios between steps means exponential, not linear

Key takeaway

Doubling and halving

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