ICSE-VIII-Mathematics
05: Playing with Number Class 8 Maths
Qstn# D-11 Prvs-Qstn
- #115 × 2 is a multiple of 11?Ans : Sum of digit in even place = x
And sum of the digits in odd place = 5 + 2 = 7
Difference of the sum of the digits in even places
And in odd places = x - 7
5 × 2 is a multiple of 11
⇒ x - 7 = 0, 11, 22
⇒ x - 7, 18, 29,
Since, x is a digit x = 7