Question

How to find the sum first ten multiples of 7? I

Answer 1

14 21 28 35 42 49 56 63 and70 are first 10 multiple of 7. write the table of 7 .

Answer 2

• The sum of first 10 multiple of 7

    = 7 + 14 + .................+ 70

     = 7 ( 1+2+...............+10)

     = 7 ( 10 x 11/2)        [using sum of natural no . = n ( n+1)/2]

     = 7 x 55 = 375

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