Hi Ronald,
I would suggest you try the Marking Guide for this. You choose 'Marking guide' under 'Grading Method' in the settings.
The Marking Guide gives you the opportunity to set up a form with different marking criteria; you can award a grade to each criterium and Moodle calculates the grade for you based on your previous settings. It is a bit tricky that when you choose 'Marking Guide' in the settings, you don't get to set up this form yet, so you don't see the advantages of this method straight away. You can set up the form after creating the assignment: when you have chosen 'Marking Guide' as your grading method (Instead of Simple Direct Grading) and you have created the assignment, you can see 'Advanced grading methods' under 'Assignment settings' in your settings block. You click on that and there you have the opportunity to set up the marking guide exactly to your specifications. This can also be used to allow students to see in advance how the grading criteria are set up.
I hope this answers your question, good luck with your offline assignments!