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What is the largest digit that can be placed in the blank to make 53_21 divisible by 9?

Sagot :

The answer is 7 since 53721 divided by 9 is equal to 5969.
Divisibility rule:
The number is divisible by 9 if the sum of the digits of the number is divisible by 9.

5 + 3 + 2 + 1 = 11

18 is divisible by 9, to find blank, simply subtract the numbers:
18 - 11 = 7

Check:
53721 ÷ 9 = 5969

Therefore, the answer to your question is 7.