①37+40=
②46-26=
③80-38=
④28+35+17=
⑤37+48-80=
⑥86-(60-24)=
24÷3= 5×5= 27÷9= 12÷3=
20÷5= 24÷6= 30÷5= 4×7=
4×9= 32÷8= 21÷7= 18÷3=
①87-38=
②56+37=
③61-(21-6)=
④48+6-29=
⑤64-(17+28)=
①45+28+27=
②80-28-34=
③96-47+29=
④68+28-57=
⑤93-27-35=
⑥6+78-48=
①70-47=
②38+47=
③63-28=
④53+46-24=
⑤72-34-27=
⑥100-(35+38)=
①36+27=
②70-59=
③95-(28+18)=
④49+8+13=
⑤90-29-37=
⑥33-15+43=
+5<20 5×5> <4×4