10th maths tamil medium chapter 5 exercise 5.3 full 10th maths exercise 5.3 sum 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13 and 14 10th maths exercise 5.3 1st, 2nd, 3rd, 4th , 5th, 6th, 7th, 8th, 8th, 10th, 11th, 12th, 13th and 14th sum