Math Crossword Puzzle

Fill in the missing numbers to complete the equations!
+
4
=
6
+
1
+
=
4
1
+
+
=
+
2
8
+
=
20
=
+
=
=
16
+
=
20
=
19
+
=
20
1
2
3
3
4
11
12
14
19

Equations: