40+650=
930-60=
900×8=
698×7≈
①49÷7+27
②69-9×3
③77-40+37
④(50-20)÷6
÷6=90 7×=490 100÷ =50
200- =50 300+=1000 -60=90
①﹣(+)
②8.89﹣1.84﹣3.16
③÷9+×
④12.5×0.32×2.5