a
)
30
+
20
+
40
=
____________________
b
)
70
+
20
+
10
=
____________________
c
)
40
+
40
-
10
=
____________________
d
)
90
+
10
-
10
=
____________________
e
)
30
+
50
-
40
=
____________________
f
)
20
+
30
-
30
=
____________________
g
)
100
-
20
+
10
=
____________________
