20以内三连减口算练习题(已排版)时间:错误率:14-2-6=19-5-11=14-2-12=10-6-3=19-3-6=14-12-2=18-9-1=16-1-6=20-14-5=1...
20以内加减法口算练习题时间:错误率:19-3=5+1=9-4=19-16=2+3=19-12=20-2=1+6=17-6=8-6=8+8=13-12=20-8=12+1=17-14=17-15...
整十数加减整十数练习题用时:错误:20-10=100-30=70-30=100-40=40+10=20+30=50+10=40-20=20+10=20+40=30-20=60-40=10+90=60...
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