309×6 = 503-179= ※1000-859 =
698×8 = 380×7 = ※968+ 137 =
8×9+67
(317-281)÷4
593-(271+169)
34×6+234 121×(83-74) 17×6+246 ÷6
⑴363-45+55 ⑵(762-698)÷8 ⑶638-9×8 ⑷903-(251+359)
240+190=
450-170=
38+49=
80-39=