(1)310 + 690 =
(2)830 + 610 =
(3)930 + 210 =
(4)440 + 720 =
(5)290 - 210 =
(6)590 - 410 =
(7)270 - 140 =
(8)650 - 190 =
(9)840 - 730 =
(10)340 + 360 =
(11)920 - 530 =
(12)580 + 400 =
(13)540 - 220 =
(14)350 - 260 =
(15)550 - 440 =
(1)310 + 690 =
(2)830 + 610 =
(3)930 + 210 =
(4)440 + 720 =
(5)290 - 210 =
(6)590 - 410 =
(7)270 - 140 =
(8)650 - 190 =
(9)840 - 730 =
(10)340 + 360 =
(11)920 - 530 =
(12)580 + 400 =
(13)540 - 220 =
(14)350 - 260 =
(15)550 - 440 =