小数口算说课讲解.doc

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1、小数口算__________________________________________________口算13.02÷10=0.25×1000=0.007×100=31.7÷10=1÷100=0.624×100=98÷1000=53.4÷100=1.26+3.74=4.32—2.3=8.97—0.31=6.54—5.4=1.25+4.75=8.73+2.27=8—0.7=4.2—2.8=0.09+10.1=8.5—1.5=6.2+8=12.8—2.4=6.5+4.5=10—3.9=1.7+12.3=9.2+1.

2、8=0.56×10=4×2.5=1.2×4=0.8×6=2.7×2=0.2×4=0.8×0.4=0.5×0.14=3.5+6.5=1—0.5=3.8+1.2=1.7—0.4=0.12×4=0.25×4=1.25×0.8=0.08×0.2=____________________________________________________________________________________________________9.8+10.2=2.5+7.5=1.25×8=25×4=0.64×10=360÷6

3、=420÷7=810÷9=10—9.1=2.7+12.3=5.7+4.3=3—1.99=4.4+5.6=9.7—5.2=0.5+4.6=3.3+4.05=1÷1000=0.634×10=78÷1000=5.67÷100=8.88×100=10.47÷100=1.005×100=73÷1000=7.06÷10=0.789×1000=7.004×100=0.01÷10=1.36+3.63=4.42—2.3=8.88—0.31=6.54—5.4=1.55+4.45=6—0.5=4.3—2.5=0.08+10.1=1.1+0

4、.12=22.4+0.6=0.03+0.6=0.7—0.61=口算2____________________________________________________________________________________________________2—0.99=3.4+5.6=9.7—5.2=7—1.9=8—0.9=4.5—0.5=3.7+6.3=4.5+1.5=0.36×0.2=12.5×8=0.6×0.7=2.5×8=0.3×0.3=1.25×8=2.4×5=0.1×6.7=5.2+2.5=5

5、.6—3.3=9—0.7=0.9+0.07=4.2—2.8=4.75+2.25=1.01+3.99=8.5—0.5=0.3×500=7.84×0=0.4×0.8=0.32×2=0.8×3=1.25×8=0.08×4=0.31×4=3.5+6.5=10—0.6=3.8+2.2=1.4—0.6=42.3÷10=6.48×100=58.6÷100=5.34÷100=3.02÷100=0.25×1000=0.007×100=31.7÷10=___________________________________________

6、_________________________________________________________7.25+0.75=2.6+7.4=8.09+1.99=9.3—7.2=8.5—2.5=6.4+5=12.4—2.2=4.5+6.5=3.6+7.4=15.5+14.5=2.75+1.25=9.62+0.38=5.2+2.5=3.3+5.6=12.64—2.64=1.2+0.3=0.56×1000=25×0.4=0.12×4=72.5×10=0.8×4=0.6×0.7=0.3×0.3=1.25×8=0.1

7、×6.7=0.3×500=3.45×0=0.63×10=9.5+0.5=10×0.5=24.9—9=0.32×3=5.5+5=0.08×4=1.1×0.9=70×0.02=__________________________________________________