One way to add two-digit numbers that are written horizontally is to
write them vertically.
For example; 23 + 34 = ____, may be written as:
2
3
+ 3
4
One way to subtract two-digit numbers that are written horizontally is to write them
vertically.
For example; 47 - 25 = ____, may be written as:
4
7
- 2
5
Rewrite the following problems and solve.
57 + 31 =
+
3 1
24 + 45 =
+
4 5
34 + 35 =
3 4
+
12 + 77 =
+
7 7
76 - 13 =
-
1 3
52 - 21 =
-
2 1
45 - 25 =
4 5
-
63 - 23 =
-
2 3
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