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-...