Calendar
If we take a calendar for a month of the year
Sun Mon Tue Wed Thu
1
Fri
2
Sat
3
4
11
18
5
12
19
6
13
20
7
14
21
8
15
22
9
16
23
10
17
24
25
26
27
28
29
30
31
and draw a 3 by 3 square around 9 of the numbers as shown
then we have:
6
7
8
13
14
15
20
21
22
Adding the four corners gives an answer of 56.
6 + 8 + 20 + 22 = 56
Investigate this situation further by posing some questions
of your own and by searching for the answers