I was completely stumped by this last puzzle, but maybe you’ve already figured it out ?

You will see answers to these puzzles :

1) Matchstick puzzle 9-8=3
2) Matchstick puzzle 6-4=7
3) Matchstick puzzle 1-3=3
4) Matchstick puzzle 9-7=1
5) Matchstick puzzle 2-3=7