Arithmetic Operator Puzzles

#1585: 4 _ 2 _ 4 _ 3 = 6 easy #1586: 4 _ 2 _ 4 _ 5 = 10 easy #1587: 4 _ 2 _ 4 _ 7 = 14 medium #1588: 4 _ 2 _ 4 _ 9 = 18 hard #1589: 4 _ 2 _ 4 _ 3 = 11 easy #1590: 4 _ 2 _ 4 _ 4 = 12 easy #1591: 4 _ 2 _ 4 _ 4 = 4 easy #1592: 4 _ 2 _ 4 _ 5 = 13 easy #1593: 4 _ 2 _ 4 _ 6 = 14 medium #1594: 4 _ 2 _ 4 _ 7 = 15 hard #1595: 4 _ 2 _ 4 _ 7 = 1 easy #1596: 4 _ 2 _ 4 _ 8 = 1 easy #1597: 4 _ 2 _ 4 _ 9 = 17 hard #1598: 4 _ 2 _ 4 _ 9 = -1 easy #1599: 4 _ 2 _ 4 _ 6 = 3 easy #1600: 4 _ 2 _ 5 _ 1 = 9 easy #1601: 4 _ 2 _ 5 _ 2 = 8 easy #1602: 4 _ 2 _ 5 _ 3 = 13 easy #1603: 4 _ 2 _ 5 _ 3 = 7 easy #1604: 4 _ 2 _ 5 _ 4 = 14 medium #1605: 4 _ 2 _ 5 _ 4 = 6 easy #1606: 4 _ 2 _ 5 _ 5 = 15 medium #1607: 4 _ 2 _ 5 _ 6 = 16 medium #1608: 4 _ 2 _ 5 _ 6 = 4 easy #1609: 4 _ 2 _ 5 _ 7 = 17 hard #1610: 4 _ 2 _ 5 _ 7 = 3 easy #1611: 4 _ 2 _ 5 _ 8 = 18 hard #1612: 4 _ 2 _ 5 _ 9 = 19 hard #1613: 4 _ 2 _ 5 _ 9 = 1 easy #1614: 4 _ 2 _ 6 _ 4 = 7 easy #1615: 4 _ 2 _ 6 _ 4 = 1 easy #1616: 4 _ 2 _ 6 _ 2 = 11 easy #1617: 4 _ 2 _ 6 _ 3 = 10 easy #1618: 4 _ 2 _ 6 _ 6 = 9 easy #1619: 4 _ 2 _ 6 _ 3 = 6 easy #1620: 4 _ 2 _ 6 _ 3 = 16 medium #1621: 4 _ 2 _ 6 _ 9 = 12 medium #1622: 4 _ 2 _ 6 _ 4 = 3 easy #1623: 4 _ 2 _ 6 _ 3 = 1 easy #1624: 4 _ 2 _ 7 _ 7 = 9 easy #1625: 4 _ 2 _ 7 _ 2 = 12 medium #1626: 4 _ 2 _ 7 _ 3 = 17 hard #1627: 4 _ 2 _ 7 _ 3 = 11 medium #1628: 4 _ 2 _ 7 _ 4 = 18 hard #1629: 4 _ 2 _ 7 _ 4 = 10 medium #1630: 4 _ 2 _ 7 _ 5 = 19 hard #1631: 4 _ 2 _ 7 _ 5 = 9 easy #1632: 4 _ 2 _ 7 _ 6 = 20 hard