## What is the germination rate of these saved lettuce seeds?

I planted 1 lettuce seed in each of these circular ‘cells’ 4 days ago.

Do you think they are growing well? Explain how you know.

Can you work out the fraction that have germinated?

Not all seeds will grow successfully. Sometimes seed packets show a germination percentage rate (%). In other words, this tells you on average how many seeds out of 100 you would expect to germinate.

A gardener sowed 100 of the Calendula ‘Fiesta Gitana’ seeds shown above. She observed that 90 of the seeds germinated successfully. Compare her results with the germination percentage shown on the seed packet.
Can you explain why they are different?

You can convert your germination fraction into a ‘germination
percentage rate’, like we saw on these seed packets like this:

1. Identify the numerator (top) and denominator (bottom) of your fraction.
2. Use a calculator to divide the numerator by the denominator.
3. This gives you the decimal equivalent to the fraction.
4. Multiply this by 100 to calculate the percentage. That’s it!