小学五年级数学上期口算比1.doc

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1、小学五年级数学上期口算比赛三江第一小学年级班学生一、估算：（每题1分，共12分。）0.49×2.8≈4.6×3.99≈50.2×2.98≈7.3×10.3≈7.8×5.5≈3.01×5.3≈71.6÷0.83≈3.23÷0.79≈9.89÷3.3≈71.8÷8.02≈0.42×0.72≈0.23×0.05≈二、口算：（每题1分，64分。）13.5÷0.5=2.1×4=0.6×1.3=4.5×2=8.1÷3=0.23×8=0.05×2=1.25×8=2.5×0.4=1.7×0.5=3.9÷1.3=0.46÷2.3=32.8÷0.04=1.82÷0.2=0.51÷17=6.3÷2

2、.1=0.06×70=90×1.5=0.36×20=42.6÷6=5.95÷0.7=32.2÷0.2=0.77÷11=4.288+3.2=2.7÷3=0.35×3=0.56÷14=0.4×0.8=0.64÷0.8=0.24+0.36=1-0.77=4.4×0.5=13.2-0.6=7.5+2.5=4.8÷0.12=0.54÷1.8=0.67+1.24=1.6×0.4=4.2÷0.01=0.63÷0.9=1.27+0.73=280÷0.7=13×0.5=0.15×4=3.3×30=2.8×0.4=92÷0.4=5.6÷70=1.4÷5=3.9÷3=8.5×0.2=9.8×4=0

3、.17×5=6÷12=5.2÷1.3=89.36×10=10×7.6=93.2×100=0.67+1.23=7.7×0.9=1÷0.01=84÷4.2=5.24-2.4=3.82+0.18=三、巧算：（每题2分，共24分。）54÷0.25÷4=8.6÷0.2÷5=1÷0.25÷0.4=0.56÷28÷2=32÷1.6÷0.4=4.8÷4÷0.6=1.93+6.3+2.07=75-13.5-6.5=40÷（0.5×8）=1.23×50×0.2=8.83×15+1.17×15=0.8×37.4×12.5=