Hello
The only way to determine exact grade is to see the notes, either a photo or better yet in person. The value is as determined in the Charlton Canadian Government Paper Money Catalog, 2014 edition, which you can purchase or possibly check out your local library to view it. The serial numbers plus the signatures also play a part in its value. If you posted photos that will help you. As to consecutive numbers, there really is no premium over individual note values. Hope this helps.