123+25=148 123-35=88 56×7=392 135÷5=27 248+89=337 ...146-23=123 ...155×5=775 ...456-12=38...456+45=501 ...546-457=89 ...45×10=451 ...564-12=47...879+54=933 ...896-546=350 ...56×12=672.45-5=9...45...