Sample questions Class 3, medium level. Your worksheet will have new questions. 1.819 − 252 = ___819−2522.416 − 221 = ___416−2213.623 − 573 = ___623−5734.517 − 274 = ___517−2745.794 − 339 = ___794−3396.757 − 281 = ___757−2817.670 − 635 = ___670−6358.973 − 425 = ___973−425