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Guide to solving Grade 4 Math problems on page 97 (including solution methods)
Solving Exercise 1 on page 97 of the textbook
Problem statement:
Among the following numbers, which ones are divisible by 9?
99; 1999; 108; 5643; 29385
Solution method:
Divisibility rule by 9: Numbers whose sum of digits is divisible by 9 are divisible by 9.
Answer:
2. Solving Grade 4 Math Problem 2 on Page 97 of the Textbook
Problem statement:
Among the following numbers, which number is not divisible by 9?
96; 108; 7853; 5554; 1097
Solution method:
A number is not divisible by 9 if the sum of its digits is not divisible by 9.
Answer:
+) Number 96 has a sum of digits equal to 9 + 6 = 15.
Since 15 is not divisible by 9, number 96 is not divisible by 9.
+) Number 108 has a sum of digits equal to 1 + 0 + 8 = 9.
Since 9 is divisible by 9, number 108 is divisible by 9.
+) Number 7853 has a sum of digits equal to 7 + 8 + 5 + 3 = 23.
Since 23 is not divisible by 9, number 7853 is not divisible by 9.
+) Number 5554 has a sum of digits equal to 5 + 5 + 5 + 4 = 19.
Since 19 is not divisible by 9, number 5554 is not divisible by 9.
+) Number 1097 has a sum of digits equal to 1 + 0 + 9 + 7 = 17.
Since 17 is not divisible by 9, number 1097 is not divisible by 9.
So, among the given numbers, the numbers not divisible by 9 are:
96; 7853; 5554; 1097.
Problem statement:
Write two three-digit numbers that are divisible by 9.
Solution method:
Divisibility rule by 9: A number is divisible by 9 if the sum of its digits is a number divisible by 9.
Answer:
Students can write as follows: 351; 684.
4. Solving Grade 4 Math Problem 4 on Page 97 of the Textbook
Solution method:
Number divisible by 9: If the sum of the digits of a number is divisible by 9, then the number is divisible by 9.
Concise Guide to Solving Grade 4 Math Problems on Page 97
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Here is the solution to Grade 4 Math problem on page 97 of the textbook in the Mytour exercise section. Next, students can review the solution to the Grade 4 Math problem on page 96 or preview the solution to the practice problems on page 98 to study well and understand Grade 4 Math concepts better.
