四年级下册小数计算题讲课讲稿.doc

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1、__________________________________________________1.5-0.5=1-0.9=2.3＋0.6=0.9＋0.8=1-0.3=3.4-1.5=1.9-0.9=3.5-2.4=0.36+0.64= 3.5+4.2=6-0.5=2.7-0.4= 0.8+0.7=4.5-3=7.8-1.1=  1.5－0.5=1－0.9=2.3＋0.6=0.9＋0.8=1.9－0.9=3.5-2.4=0.36＋0.64=0.96－0.3=8.65－6.31=  2.5+0.9=1.2-0.5=7.8+1.6=0.39+0.15=3-1

2、.4=4.7-2.8=7.2-6.45=15-0.48=6.77-1.78= 3.45+5.75=3.40+58.20=49.80+49.20=111.6-99=7.8+21.02=5.6-1.42=12.5+0.9=4.5-2.83=3.75+2.25=2.98+0.56=12.53+4.67=6.07+4.89= 5.64-1.78=10.2-6.45=5-0.41=0.3+1.5=2.5+9.8=7.6+1.3=4.4+5.7=2.3+7.7=5.7+3.1=7.69+2.31=9.16+2.64=5.68+12.22=________________

3、____________________________________________________________________________________16.8+16.5=26.3+14.6=6.9+3.4= 52.3+64.7=12.75-5.3=8.24+16.93= 0.75＋0.4=20＋0.78=4.8＋4.2=5.7－3=4.9－1.7=1.34＋0.8=2－0.75=8.7＋0.03=0.2－0.09=8.5＋2.5=2.4－1.4=0.68＋0.42=7.82－7.2=2＋9.1=0.48＋0.52= 8.1－5.1=0.78

4、－0.24=0.8＋0.18=0.89－0.25=1－0.98=0.9＋0.1=1－0.8=4.5－4=5.6＋4=10－4.4=6＋6.6=9.5－2.7=1－0.55=3.7＋4.8=7＋3.3=3．25＋0．75=2.7＋3.9=0．7＋0．9=0.9＋1=14．6－0．4=10－0．1=14＋0．78=3＋2.7=5－0．08=1．64＋2．35=1．1－1=_________________________________________________________________________________________________

5、___8．34－6．22=1.3＋4.3=7.2＋6.9=9.3－8.8=4.4＋15.99=19.8－5.6=96.3－56.2=79.2＋56.8=1.9＋25.793=88－69.21= 136.5－105=73.4+52.1=93.1-20.9=63.1-11=0.33+9.8=7.8+6.9=0.2+2.7=5.6+4.4=9.4+0.06=0.7+0.4=0.5－0.45=10－0.1=  1.8－0.9=12.6－1.2=17+0.33=1.01+0.6=7－0.05=9－0.26= 6.14+3.83=7.93-1.64=5.23-2.36=

6、  3.44+3.36=8.63-3.48=1.16+4.77=7.74-5.85=9.35-4.74=4.93+4.75=8.17-5.26=2.26-0.86=6.55+4.68=1.1+4.5=1.9+3.4=3.45+4.6=4.45+4.5=9.4-2.75=7.3-1.26=3.83+5.55=____________________________________________________________________________________________________2.75+1.3=7.6-2.15=1.9+6.2=7.

7、1-6.6=6.8-2.8=44.4+1.4=1.7+9.66=43.3+6.3= 55.5-1.9=38.9-5.55=64.41+8.67= 0.7＋0.9=3.8＋0.6=8.24+3.76= 14＋0.78=14.6-0.34= 1.3+8.56=0.8-0.55=1-0.03=30.5+3.05=0.8-0.45=3.25＋0.75=0.78+2.2=5-0.08=10-0.1=10－7.64=13.6＋8.46=0.99＋1.1= 1.23+6.52=5.32-0.93=6.35-5.23=1.23+5.69=1.26+5.21=0.96-0.2

8、3=7.26-4.93=2.16-0.23=4.63