口算240÷40= 420÷20= 640÷40= 270÷30=360÷60= 480÷40= 900÷30= 180÷20=300÷60=
56+37=80﹣16=31.5+5=12﹣1.1= 2×0.2=2.87÷0.7=30÷50=25×8=========
口算，直接写出得数． 64﹣46= 1.72+2.38= 0.25×40= 2.4÷0.6=== 12= 8×12.5%== 0.52=
直接写出得数 25+75= 8﹣5.3= 4.65×100=×4÷×4=×2= 10÷= 350÷50=+﹣×=
2×0.3=÷12= 315﹣198=÷=
直接写得数． 76+23= 0.4×0.2= 0.32+3.2=+= 25÷0.5= 12÷=×= 43÷10%=
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= 12
= 8×12.5%=
= 0.52=
×4÷
×2= 10÷
= 350÷50=
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×
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÷12=
÷
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+
=
=
×
= 43÷10%=