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Which numbers are divisible by 9 in Exercise 1 Page 97 Math Grade 4
Guidance on Exercise 1 Page 97 Math Grade 4
Problem Statement: Identify numbers divisible by 9 from the following set: 99, 1999, 108, 5643, 29385
Methodology: Divisibility Rule for 9 states that numbers whose digits sum to a multiple of 9 are divisible by 9.
Answer:
The number 99 has a digit sum of 9 + 9 = 18.
Since 18 is divisible by 9, 99 is divisible by 9.
The number 1999 has a digit sum of 1 + 9 + 9 + 9 = 28.
Since 28 is not divisible by 9, 1999 is not divisible by 9.
The number 108 has a digit sum of 1 + 0 + 8 = 9.
Since 9 is divisible by 9, 108 is divisible by 9.
The number 5643 has a digit sum of 5 + 6 + 4 + 3 = 18.
Since 18 is divisible by 9, 5643 is divisible by 9.
The number 29385 has a digit sum of 2 + 9 + 3 + 8 + 5 = 27.
Since 27 is divisible by 9, 29385 is divisible by 9.
