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Q: What is the meaning of Subtract 2 times the last digit from the rest?

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The number must meet two criteria:Take the original number excluding its last digit and subtract two times the last digit from it. The result must be divisible by 7.Take the original number excluding its last digit and subtract nine times the last digit from it. The result must be divisible by 13.In both cases, you can repeat the "truncate-and-subtract multiple" stage several times, if required.

Double the last digit and subtract the last digit from the remaining digits.

9,000,0009,999,999 is the last 7 digit number1,000,000 is the first 7 digit numberwhen you subtract the first from the last and add one you get the above answer.

Subtract 5 times the last digit from remaining truncated number. Repeat the step as necessary. If the result is divisible by 17, the original number is also divisible by 17

the unit digit is the last digit from left or ones digit

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The number must meet two criteria:Take the original number excluding its last digit and subtract two times the last digit from it. The result must be divisible by 7.Take the original number excluding its last digit and subtract nine times the last digit from it. The result must be divisible by 13.In both cases, you can repeat the "truncate-and-subtract multiple" stage several times, if required.

Double the last digit and subtract the last digit from the remaining digits.

Subtract nine times the last digit from the rest; repeat if necessary. The result must be divisible by 13.

9,000,0009,999,999 is the last 7 digit number1,000,000 is the first 7 digit numberwhen you subtract the first from the last and add one you get the above answer.

you take the last digit in the first one and add/subtract it to the last digit in the second one and that is your answer

Yes. 7 - 2 is 5, and if the last digit on one number is 7 and the last digit on one you are subtracting from it is 2, the last digit on the answer will be a 5. That will help you in doing estimations.

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Subtract 5 times the last digit from remaining truncated number. Repeat the step as necessary. If the result is divisible by 17, the original number is also divisible by 17

The last digit: the 6.The last digit: the 6.The last digit: the 6.The last digit: the 6.

Double the last digit. Subtract it from the rest. If the result is divisible by 7, the original number is divisible by 7.

Double the last digit, subtract it from the rest. If the result is divisible by 7, the whole number is divisible by 7.

If you double the last digit and subtract it from the rest of the number and the answer is zero or divisible by 7, then the whole number is divisible by 7.

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