Arithmetic Operator Puzzles

#1969: 4 _ 6 _ 9 _ 1 = 5 easy #1970: 4 _ 6 _ 9 _ 2 = 8 medium #1971: 4 _ 6 _ 9 _ 2 = 4 easy #1972: 4 _ 6 _ 9 _ 2 = 12 medium #1973: 4 _ 6 _ 9 _ 3 = 9 medium #1974: 4 _ 6 _ 9 _ 3 = 3 easy #1975: 4 _ 6 _ 9 _ 4 = 10 medium #1976: 4 _ 6 _ 9 _ 4 = 2 easy #1977: 4 _ 6 _ 9 _ 5 = 11 hard #1978: 4 _ 6 _ 9 _ 5 = 1 easy #1979: 4 _ 6 _ 9 _ 6 = 12 hard #1980: 4 _ 6 _ 9 _ 7 = 13 hard #1981: 4 _ 6 _ 9 _ 7 = -1 easy #1982: 4 _ 6 _ 9 _ 8 = 14 hard #1983: 4 _ 6 _ 9 _ 8 = -2 medium #1984: 4 _ 6 _ 9 _ 9 = 15 hard #1985: 4 _ 7 _ 2 _ 1 = 15 hard #1986: 4 _ 7 _ 2 _ 3 = 11 medium #1987: 4 _ 7 _ 2 _ 4 = 10 medium #1988: 4 _ 7 _ 2 _ 5 = 19 hard #1989: 4 _ 7 _ 2 _ 5 = 9 easy #1990: 4 _ 7 _ 2 _ 6 = 8 easy #1991: 4 _ 7 _ 2 _ 7 = 7 easy #1992: 4 _ 7 _ 2 _ 8 = 6 easy #1993: 4 _ 7 _ 2 _ 9 = 5 easy #1994: 4 _ 7 _ 3 _ 6 = 18 hard #1995: 4 _ 7 _ 4 _ 2 = 18 hard #1996: 4 _ 7 _ 4 _ 8 = 18 hard #1997: 4 _ 7 _ 4 _ 8 = 14 medium #1998: 4 _ 7 _ 4 _ 2 = 14 medium #1999: 4 _ 7 _ 5 _ 7 = 20 hard #2000: 4 _ 7 _ 6 _ 3 = 18 hard #2001: 4 _ 7 _ 8 _ 4 = 18 hard #2002: 4 _ 7 _ 8 _ 4 = 14 medium #2003: 4 _ 8 _ 2 _ 4 = 8 medium #2004: 4 _ 8 _ 2 _ 3 = 16 hard #2005: 4 _ 8 _ 2 _ 3 = -8 medium #2006: 4 _ 8 _ 2 _ 1 = 17 hard #2007: 4 _ 8 _ 2 _ 2 = 14 hard #2008: 4 _ 8 _ 2 _ 3 = 19 hard #2009: 4 _ 8 _ 2 _ 5 = 11 medium #2010: 4 _ 8 _ 2 _ 6 = 10 medium #2011: 4 _ 8 _ 2 _ 7 = 9 medium #2012: 4 _ 8 _ 2 _ 1 = 2 easy #2013: 4 _ 8 _ 2 _ 2 = 3 easy #2014: 4 _ 8 _ 2 _ 2 = -1 easy #2015: 4 _ 8 _ 2 _ 3 = 4 easy #2016: 4 _ 8 _ 2 _ 3 = -2 easy