PLAYING WITH NUMBERS ( LECTURE 4)
BLOG 4 PLAYING WITH NUMBERS Ex 16.2 GOOD MORNING BOYS , LEARNING OUTCOMES By the end of this lesson we will be able to find the " DIGIT" to the " LETTER" in any given number using DIVISIBILITY TEST and hence solve the puzzle Exercise 16.2 : Solutions of Questions on Page Number : 260 CLICK ON THIS LINK TO UNDERSTAND EX 16.2 (NCERT) Q.1 If 21 y 5 is a multiple of 9, where y is a digit, what is the value of y ? Answer : If a number is a multiple of 9, then the sum of its digits will be divisible by 9. Sum of digits of 21 y 5 = 2 + 1 + y + 5 = 8 + y Hence, 8 + y should be a multiple of 9. This is possible when 8 + y is any one of these numbers 0, 9, 18, 27, and so on … However, since y is a single digit number, this sum can be 9 on...
