20以内减法口算练习题4000题时间：错误率：10－8=7－3=16－9=16－7=20－10=17－12=12－8=15－2=19－15=17－4=15－3=5－2=17－16=20－20=20...
完整版100以内进位加法练习题用时：错误：29＋6=87＋5=56＋9=27＋27=37＋24=4＋6=55＋7=19＋74=17＋78=46＋29=17＋14=86＋8=38＋36=4＋48=2...
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