Easy Arithmetic Puzzles

#1596: 4 _ 2 _ 4 _ 8 = 1 easy #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 #1605: 4 _ 2 _ 5 _ 4 = 6 easy #1608: 4 _ 2 _ 5 _ 6 = 4 easy #1610: 4 _ 2 _ 5 _ 7 = 3 easy #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 #1622: 4 _ 2 _ 6 _ 4 = 3 easy #1623: 4 _ 2 _ 6 _ 3 = 1 easy #1624: 4 _ 2 _ 7 _ 7 = 9 easy #1631: 4 _ 2 _ 7 _ 5 = 9 easy #1633: 4 _ 2 _ 7 _ 6 = 8 easy #1634: 4 _ 2 _ 7 _ 8 = 6 easy #1635: 4 _ 2 _ 7 _ 9 = 5 easy #1636: 4 _ 2 _ 8 _ 4 = 3 easy #1637: 4 _ 2 _ 8 _ 2 = 4 easy #1638: 4 _ 2 _ 8 _ 1 = 2 easy #1639: 4 _ 2 _ 8 _ 2 = 3 easy #1640: 4 _ 2 _ 8 _ 2 = -1 easy #1641: 4 _ 2 _ 8 _ 3 = 4 easy #1642: 4 _ 2 _ 8 _ 3 = -2 easy #1643: 4 _ 2 _ 8 _ 4 = -3 easy #1644: 4 _ 2 _ 8 _ 5 = 6 easy #1646: 4 _ 2 _ 8 _ 6 = 7 easy #1653: 4 _ 2 _ 8 _ 4 = 1 easy #1657: 4 _ 2 _ 9 _ 6 = 1 easy #1662: 4 _ 2 _ 9 _ 3 = 6 easy #1667: 4 _ 3 _ 2 _ 4 = -2 easy #1669: 4 _ 3 _ 2 _ 2 = 13 easy #1670: 4 _ 3 _ 2 _ 8 = 3 easy #1671: 4 _ 3 _ 2 _ 1 = 7 easy #1672: 4 _ 3 _ 2 _ 2 = 4 easy #1673: 4 _ 3 _ 2 _ 3 = 9 easy #1674: 4 _ 3 _ 2 _ 3 = 3 easy #1675: 4 _ 3 _ 2 _ 5 = 1 easy #1678: 4 _ 3 _ 2 _ 7 = -1 easy #1680: 4 _ 3 _ 2 _ 8 = -2 easy #1682: 4 _ 3 _ 2 _ 9 = 6 easy