珠心算 100 以内加减法练习题70-59=15+59=58+31=16+56=96-40=62-47=64-40=58-14=97-29=65+27=31+27=46-11=14+25=58-33=96-54=61+20=68-53=60-31=20+15=46-21=99-74=70-67=33+15=98-92=80-68=73-52=35-34=91-78=83-59=69-10=50-40=69-51=12+73=89-13=43-32=15+76=69-65=100-33=66-34=76-51=99-43=91-57=77-67=55-36=26-14=62-34=44-30=25-17=14+14=78-67=42-22=31+31=30+20=77-34=16+21=63-16=90-26=45-35=39+56=39+29=91-67=73+16=29+46=52-10=75-25=31+60=58-51=71-20=45-13=95-60=57+26=50-44=99-75=36-31=42-24=10+23=66-53=52-27=94-60=72-16=95-49=31+50=81-69=90-38=98-31=100-56=100-77=62-10=63-44=56-54=40+43=14+51=73-43=79-59=15+16=12+20=95-39=49-24=54-12=80-65=45+54=30-16=48-44=45+24=65-65=22+71=67+10=74-65=73-56=97-83=74+18=10+66=68-43=75-37=92-16=25+18=58-46=84-23=94-79=97-34=68-38=50+44=37-27=89-84=40-25=89-27=27+58=60-22=99-43=12+74=2