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Step 1: Use the divisibility rule for 13

One method:

Take the last digit, multiply it by 9.

Subtract that from the rest of the number.

If the result is divisible by 13, the original number is divisible by 13.

Step 2: Apply the rule

Number: 83,525

Last digit = 5 →

5

×

9

=

45

5×9=45

Rest of the number = 8,352

Subtract:

8

,

352

45

=

8

,

307

8,352−45=8,307

Step 3: Repeat the process

Last digit = 7 →

7

×

9

=

63

7×9=63

Rest of the number = 830

Subtract:

830

63

=

767

830−63=767

Step 4: Repeat again

Last digit = 7 →

7

×

9

=

63

7×9=63

Rest = 76

Subtract:

76

63

=

13

76−63=13

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Aina Suraiya

Lvl 4
2w ago

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