Matchstick Puzzles

#289: Fix 3+0=12 medium #290: Fix 5+0=14 medium #291: Fix 2-7=8 hard #292: Fix 2+7=0 easy #293: Fix 4+6=4 easy #294: Fix 2+5=5 easy #295: Fix 9-3=4 easy #296: Fix 5-0=6 medium #297: Fix 5+9=73 hard #298: Fix 8+9=18 medium #299: Fix 9+5=16 medium #300: Fix 4+0=10 easy #301: Fix 6+5=3 medium #302: Fix 6-7=2 easy #303: Fix 8+0=9 hard #304: Fix 4+6=19 medium #305: Fix 2-3=6 medium #306: Fix 5+2=8 easy #307: Fix 8-1=8 hard #308: Fix 3-8=71 hard #309: Fix 4-9=73 hard #310: Fix 8+4=13 medium #311: Fix 6+0=74 hard #312: Fix 0-8=6 hard #313: Fix 9-3=72 hard #314: Fix 9-6=2 easy #315: Fix 9+1=19 medium #316: Fix 9-9=7 medium #317: Fix 8-9=15 hard #318: Fix 8+1=7 medium #319: Fix 8-5=0 medium #320: Fix 4+5=18 medium #321: Fix 8+6=0 hard #322: Fix 1+8=13 medium #323: Fix 0+7=75 hard #324: Fix 3-8=3 hard #325: Fix 5-7=5 medium #326: Fix 9+1=0 hard #327: Fix 8+5=11 easy #328: Fix 8+3=10 easy #329: Fix 8+5=2 hard #330: Fix 0+6=15 medium #331: Fix 5-5=70 hard #332: Fix 2-4=8 hard #333: Fix 1+7=0 medium #334: Fix 6+8=5 medium #335: Fix 9+2=6 hard #336: Fix 7-3=70 hard