Medium Matchstick Puzzles

#427: Fix 6+4=13 medium #433: Fix 1-1=8 medium #438: Fix 7+5=13 medium #442: Fix 7+9=9 medium #443: Fix 9+8=10 medium #453: Fix 7+5=1 medium #458: Fix 1+6=8 medium #464: Fix 3-2=6 medium #465: Fix 1-6=2 medium #466: Fix 5+1=5 medium #467: Fix 7-1=2 medium #468: Fix 7+0=9 medium #470: Fix 5+3=3 medium #471: Fix 5+5=1 medium #474: Fix 5-0=8 medium #478: Fix 6+1=12 medium #480: Fix 0+2=18 medium #482: Fix 8+6=5 medium #485: Fix 1-6=6 medium #487: Fix 0-1=7 medium #492: Fix 5+7=13 medium #497: Fix 7+6=1 medium #498: Fix 6+2=1 medium #507: Fix 7+8=1 medium #517: Fix 0+9=18 medium #518: Fix 3+0=17 medium #523: Fix 8-0=1 medium #525: Fix 6+9=12 medium #528: Fix 0+6=13 medium #530: Fix 2+8=9 medium #531: Fix 9+4=12 medium #532: Fix 1+3=18 medium #538: Fix 8-2=1 medium #539: Fix 9+0=15 medium #543: Fix 9+8=16 medium #544: Fix 6+4=19 medium #547: Fix 2+8=0 medium #549: Fix 8-1=9 medium #551: Fix 3+7=19 medium #553: Fix 2+8=6 medium #554: Fix 9+8=18 medium #557: Fix 0+2=6 medium #561: Fix 5+2=4 medium #562: Fix 3+6=12 medium #564: Fix 6-5=8 medium #565: Fix 2+6=1 medium #568: Fix 5+7=5 medium #571: Fix 2-7=3 medium