Arithmetic Operator Puzzles

#289: 1 _ 6 _ 3 _ 3 = -1 easy #290: 1 _ 6 _ 3 _ 4 = -2 easy #291: 1 _ 6 _ 3 _ 5 = 7 easy #292: 1 _ 6 _ 3 _ 6 = 8 easy #293: 1 _ 6 _ 3 _ 6 = -4 easy #294: 1 _ 6 _ 3 _ 7 = 9 easy #295: 1 _ 6 _ 3 _ 7 = -5 easy #296: 1 _ 6 _ 3 _ 7 = 14 medium #297: 1 _ 6 _ 3 _ 8 = -6 medium #298: 1 _ 6 _ 3 _ 8 = 16 hard #299: 1 _ 6 _ 3 _ 9 = 11 hard #300: 1 _ 6 _ 3 _ 9 = -7 hard #301: 1 _ 6 _ 3 _ 8 = 4 easy #302: 1 _ 6 _ 4 _ 3 = 9 easy #303: 1 _ 6 _ 4 _ 8 = 4 easy #304: 1 _ 6 _ 4 _ 6 = 10 easy #305: 1 _ 6 _ 4 _ 8 = 13 hard #306: 1 _ 6 _ 4 _ 3 = -7 easy #307: 1 _ 6 _ 4 _ 8 = -2 easy #308: 1 _ 6 _ 4 _ 6 = -8 medium #309: 1 _ 6 _ 4 _ 4 = 5 easy #310: 1 _ 6 _ 4 _ 8 = 12 medium #311: 1 _ 6 _ 4 _ 9 = 6 easy #312: 1 _ 6 _ 5 _ 3 = 11 easy #313: 1 _ 6 _ 5 _ 2 = 15 medium #314: 1 _ 6 _ 6 _ 4 = 10 easy #315: 1 _ 6 _ 6 _ 9 = 5 easy #316: 1 _ 6 _ 6 _ 4 = -8 medium #317: 1 _ 6 _ 6 _ 9 = -3 medium #318: 1 _ 6 _ 6 _ 2 = 9 easy #319: 1 _ 6 _ 6 _ 3 = 8 easy #320: 1 _ 6 _ 6 _ 6 = 5 easy #321: 1 _ 6 _ 6 _ 3 = 12 easy #322: 1 _ 6 _ 7 _ 3 = 15 hard #323: 1 _ 6 _ 7 _ 7 = 5 easy #324: 1 _ 6 _ 7 _ 3 = 14 medium #325: 1 _ 6 _ 8 _ 4 = 13 hard #326: 1 _ 6 _ 8 _ 4 = -2 easy #327: 1 _ 6 _ 8 _ 2 = 10 medium #328: 1 _ 6 _ 8 _ 4 = 8 medium #329: 1 _ 6 _ 8 _ 2 = 2 easy #330: 1 _ 6 _ 8 _ 8 = 5 easy #331: 1 _ 6 _ 8 _ 3 = 16 hard #332: 1 _ 6 _ 8 _ 4 = 12 medium #333: 1 _ 6 _ 8 _ 3 = 4 easy #334: 1 _ 6 _ 9 _ 6 = 5 easy #335: 1 _ 6 _ 9 _ 3 = -1 easy #336: 1 _ 6 _ 9 _ 6 = -3 medium