Final answer:
To convert from compressed fresh yeast to instant yeast, multiply the amount of fresh yeast by 0.33 or one third to get the equivalent amount of instant yeast. For example, 30g of fresh yeast is equivalent to about 10g of instant yeast when rounded.
Step-by-step explanation:
When converting from compressed fresh yeast to instant yeast, the general rule of thumb is that you need less instant yeast than fresh yeast because instant yeast is more concentrated. A common conversion factor used is to multiply the amount of fresh yeast by 0.33, or one third, to get the equivalent amount of instant yeast. Therefore, if you start with a quantity of fresh yeast, you multiply that quantity by 0.33 to get the amount of instant yeast you would need.
For example, if a recipe calls for 30g of fresh yeast, you would use 30g multiplied by 0.33 to find out how much instant yeast you need. That calculation would give you 9.9g of instant yeast, which you can round to 10g for ease of use.