98
+
96
Tip: Think “100 − extra”. Then do 200 − (extraA + extraB).
=
(100 −
)
+
(100 −
)
=
200 −
=
98
+
96
=
STEP 1
Make 100.
98
+
=
100
96
+
=
100
100
+
100
=
200
STEP 2
Subtract the extra.
+
=
200
−
=