小學五年级数学计算能力比赛试题.doc
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小学五年级数学计算能力比赛试题
班级 姓名 成绩
一、估算
81÷20≈ 32×19≈ 1500÷31≈
99×20≈ 999÷500≈ 631÷30≈
59×80≈ 881÷10≈ 349÷70≈
1020÷100≈ 71÷9≈ 423÷7≈
59×40≈ 82×27≈ 992.12≈
2983≈ 1.257.98≈ 494≈
300560≈ 0.4972.003≈ 3982.09≈ 10122.08≈ 50710.14≈ 2.5139.87≈ 102351.02≈ 0.098100.09≈ 48.970.21≈ 398.70.396≈ 51.0319.35≈ 124.98.1≈
20.13649.88≈ 810.0390.02≈ 1.25379.46≈ 14.892.16≈ 59829.7≈ 33.3332.98≈ 52.118.75≈ 1.0330.21≈ 60.23.01≈ 49.8350.04≈ 1042.1≈ 818.9≈
150.31.98≈ 9.872.13≈ 10.045.02≈ 98.872≈ 25.18.03≈ 9.951≈ 382.13≈ 4882.3≈ 522.14≈ 0.01299≈ 1.875.06≈ 1.267.88≈
1.020.51≈ 10250.64≈ 98.6921.3 ≈ 0.20.51 ≈ 2.4821≈ 1001.98 ≈ 1.90.52≈ 5.230.522≈ 3613.59≈ 8.6698≈ 5972.1≈ 9.752.16≈
1012.03≈ 1.52.004≈ 4821≈ 512.1≈ 300.23.05≈ 167.98≈ 4120.3≈ 1.020.987≈ 458460≈ 1000.52001≈ 0.5330.541≈ 990.199≈
801.631.998≈ 4.9720.33≈ 81.253≈ 601.98≈ 9.971.98≈ 512.012≈ 8022.478≈ 4034.032≈ 5155.149≈ 182.997≈ 3333.0003≈ 1045.1≈
1.0260.1≈ 0.262.61≈ 3.59.98≈ 4.79.97≈ 12.528.03≈ 469.98≈ 389.99≈ 569.89≈ 4.3698.97≈ 62.196.22≈ 10.359.98≈ 540.539≈
二、口算
636-198= 3.6÷0.36= 7÷14=
37×5= 9-0.9= 72×0.4=
72÷0.4= 25×24=??? ??4.2÷0.2=????
12-0.2= 1.25×8=?? ???27+=
910-= 18×40= 910÷70=
78-= 3÷8= 10÷0.1=
0.8×12.5= 8.1÷0.03= 1.5×0.5=
10÷0.5= ?0.5÷10= 410-210=
7÷1.4= 72.8÷0.8= 0.77+0.33=
10-0.9= 8.2+0.54+0.46= 26.26÷26=
4.57+6.43= 7.9×11-7.9= 3.14×32=
10.1×30= 2÷0.2-2= 1.8×4×0.5= 1.5-1.5×0.2= 578+2
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