Sample questions Class 4, medium level. Your worksheet will have new questions. 1.4,826 − 3,648 = ___4826−36482.5,261 − 2,371 = ___5261−23713.7,785 − 4,788 = ___7785−47884.8,107 − 5,039 = ___8107−50395.4,456 − 4,358 = ___4456−43586.8,183 − 7,709 = ___8183−77097.4,520 − 4,125 = ___4520−41258.9,420 − 2,860 = ___9420−2860