Three More Matches

The hardest of the More Matches sets: exactly three matches have to be added.

8 puzzles

1. 1 · No. 436Subtraction: 5 − 5 = 716 matches · add 3 matches
2. 2 · No. 437Subtraction: 3 − 5 = 1117 matches · add 3 matches
3. 3 · No. 438Subtraction: 17 − 7 = 516 matches · add 3 matches
4. 4 · No. 439Subtraction: 13 − 7 = 4222 matches · add 3 matches
5. 5 · No. 440Two Operations: 7 + 5 − 7 = 022 matches · add 3 matches
6. 6 · No. 441Subtraction: 39 − 1 = 5724 matches · add 3 matches
7. 7 · No. 442Two Operations: 1 + 7 + 7 = 1622 matches · add 3 matches
8. 8 · No. 443Two Operations: 2 + 5 − 1 = 1324 matches · add 3 matches