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1、练习十八,人教版小学数学第八册,1.口算。,0.34+0.45,0.57+0.9,3.8+0.12,1.3 0.7,8 4.6,0.6 0.37,=0.79,=1.47,=3.92,=0.6,=3.4,=0.23,2.用简便方法计算。,0.384+0.36+2.64,5.26+3.43+0.74,0.384+(0.36+2.64),0.384+3,3.384,5.26+0.74+3.43,6+3.43,9.43,1.29+3.7+0.71+6.3,(1.29+0.71)+(3.7+6.3),2+10,12,3.9+4.08+3.92+1.1,(3.9+1.1)+(4.08+3.92),5+8,
2、13,3.计算下面各题，怎样简便就怎样计算。,5.6+2.7+4.4,5.6+4.4+2.7,10+2.7,12.7,9.5+4.856.13,14.35 6.13,8.22,10.75+0.4 9.86,11.15 9.86,1.29,9.14 1.43 4.57,9.14(1.43+4.57),9.14 6,3.14,77+2.7+2.3+25,77+(2.7+2.3+25),77+(5+25),51.27 8.66 1.34,51.27(8.66+1.34),51.27 10,77+30,41.27,107,34.17,33.96,34.06,34.00,4.,4.75,0.25,69.
3、00,31.00,5.,6.口算。,0.7+0.5,7.8+0.6,4.8 3,0.56-0.46,0.39+0.15,1 0.04,1.2,8.4,1.8,0.1,0.54,0.96,6.口算。,0.7+0.5,7.8+0.6,4.8 3,0.56-0.46,0.39+0.15,1 0.04,1.2,8.4,1.8,0.1,0.54,0.96,7.,你能提出什么数学问题？你会解答自己提出的问题吗？,3.6,5.2,9.3,8.1,14.7,23.7,8.,（1）2003年全世界的人口总数是多少？,（2）通过计算你还可以获得哪些信息？,7.26+8.69+8.51+0.32+38.23,15.95+8.51+0.32+38.23,24.46+0.32+38.23,24.78+38.23,63.01(亿人),答：2003年全世界的人口总数是63.01亿人。,352.14,340.92,327.78,111.60,99.00,99.00,194.40,174.60,175.50,255.24,265.44,252.30,
