346+51{#blank#}1{#/blank#}264+151        551+193{#blank#}2{#/blank#}738+49   

375+416{#blank#}3{#/blank#}428+258       252+492{#blank#}4{#/blank#}345+248 

273+346{#blank#}5{#/blank#}523+180       651+85{#blank#}6{#/blank#}285+451

653＜{#blank#}1{#/blank#}53          457＞{#blank#}2{#/blank#}69          340＞ 3{#blank#}3{#/blank#}4

9{#blank#}4{#/blank#}2＜931       42{#blank#}5{#/blank#}＞425       {#blank#}6{#/blank#}35＜234

A={#blank#}1{#/blank#}

B={#blank#}2{#/blank#}

C={#blank#}3{#/blank#}

D={#blank#}4{#/blank#}

204×4800                  47+3990                 316+209500

125×81000                298×82400             751-413300