During a month to month tenancy your landlord can raise your rent any amount if he/she gives you written notice.

A 30-day notice must be given, however a 60-day notice is required in its place if the rent increase plus any increased in the previous 12 months add up to more than 10%.

So in calculating to see if the most recent increase is over 10% you will also need to include any increases 12 months prior as a combined total calculation.

YOUR LANDLORD CANNOT RAISE THE RENT DURING A LEASE UNLESS IT IS AGREED TO IN THE LEASE AGREEMENT.