Observe the following patterns, then find the sum of 1+3+5+........11
1=1×1=11+3=2×2=41+3+5=3×3=9
36
4
25
64
Step 1; Observe the number pattern.
Observing the pattern, we notice that
1+3+5+........11 =6×6=36
Hence, the correct option is (A )