To verify that the sum of first n odd natural numbers is n2 ,
• Draw squares of sides 1 cm, 2 cm, 3 cm, 4 cm and 5 cm and cut them.
•Divide the squares into smaller squares of side 1×1 and shade each squarewith a different colour.
•Count the number of squares in different colour bands and write the numbers atthe corners as shown.
12 = 1
22 = 1+3=4
32= 1+3+5=9
42= 1+3+5+7=16
52==1+3+5+7+9=25
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1+2+3+4+5+6+7+8+9+10+11+12+13+14+15+16+17+18+19+20
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