21×8≈{#blank#}1{#/blank#}     48×3≈{#blank#}2{#/blank#}     721×5≈{#blank#}3{#/blank#}     592×7≈{#blank#}4{#/blank#}

43+59=     80-26=     203×3=     804-95≈     380×0×5=

7×200=     30×9=     820+0=     287×4≈      44×4=

103×3=     36÷6=     420×1=     500×4=      7×7-7=

48÷8=      35×2=     8÷2×5＝    198+306≈    12×4+2=

+ =       1- =      - =        + =

300+700=    30×10=      98-36=         813-489≈

260-200=     3×32=       500×6=        298-102≈

70+540=     0×980=      7000-2000=    79×5≈

{#blank#}1{#/blank#}×{#blank#}2{#/blank#}={#blank#}3{#/blank#}

204×4800                  47+3990                 316+209500

125×81000                298×82400             751-413300