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Observe the following pattern and complete. $=1$ $1+3$ $=4=2^{2}$ $1+3+5=9=3^{2}$ $1+3+5+7=16=4$ ou agree $1=1=1^{2}$ $1+3=4=2^{2}$ $1+3+5=9=3^{2}$ $1+3+5+7=16=4^{2}$ $1+3+5+7+9=25=5^{2}$ $1+3+5+7+9+11=$ $=\left(\right)^{2}$ $1+3+5+7+9+11+13=$ .. $=\left(\right)^{2}$

Observe the following pattern and complete. $1=1^{2}$ $1+3=4=2^{2}$ $1+3+5=9=3^{2}$ $+3\div 5+7-16=4$ $1=1=1^{2}$ $1+3=4=2^{2}$ $1+3+5=9=3^{2}$ $1+3+5+7=16=4^{2}$ $1+3+5+7+9=25=5^{2}$ $1+3+5+7+9+11=$ =. $=\left(\right)^{2}$ $3=..........$ $=\left(\right)^{2}$ $1+3+5+7+9+11+13=$ N this, we can generalize that the sum of first 'n' odd natural numbers is equal to 'n".

$2$ , Interesting patterns in square: Observe the following pattern and complete. $1=1$ $1+3=4=2^{2}$ $1+3+5=9=3^{2}$ $+3+5+7=16=4$ ou agree $1=1=1^{2}$ $1+3=4=2^{2}$ $1+3+5=9=3^{2}$ $1+3+5+7=16=4^{2}$ $1+3+5+7+9=25=5^{2}$ $1+3+5+7+9+11=$ $=\left(\right)^{2}$ $1+3+5+7+9+11+13=$ $=\left(\right)^{2}$ n this, we can generalize that the sum of first 'n'odd natural numbers is equal to 'n".

$2+3+5-8-3+10$

$2+3+5=7$