Are you getting a great understanding of the strategies, but get the answers wrong due to forgetting your basic facts? You can practice, using your computer. Prototec: http://www.prototec.co.nz/maths.html
Long Division Online Calculator
Here is an online calculator that we can use to check our answers with remainders: http://www.calculatorsoup.com/calculators/math/longdivision.php
Prime Number and Roman Numerals
these posters here.