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That is correct. Considering the largest double digit whole number is 99. Unless of course, you mean adding the two digits of a double digit number alongside the two digits of another double digit number, then yes, you will have a 4 digit number. Depends how you interpret the question, and your creativity.

Q: If you add a 2 digit number to a 2 you will never get a 4 digit number?

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6

Nothing special about it. 489 +65 554

Any number when doubled becomes even. Thus the key part of the question is identifying a 3 digit even number that you can add 2 to to become a 4 digit number. The answer is 998. Thus to find the original number we need to do 998/2. This calculates to 499.

No, the proposition is FALSE.

Two-digit prime numbers whose digits add up to 10 are:193773

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No. When adding the smallest 2 digit number (= 10) to the smallest 2 digit number (again, 10) the result is a 2 digit number (10 + 10 = 20). When adding the largest 2 digit number (= 99) to the largest 2 digit number (again, 99) the result is a 3 digit number (99 + 99 = 198). As you can see, you'll either get a 2 or 3 digit number, but never a 4 digit number.

6

Nothing special about it. 489 +65 554

Any number when doubled becomes even. Thus the key part of the question is identifying a 3 digit even number that you can add 2 to to become a 4 digit number. The answer is 998. Thus to find the original number we need to do 998/2. This calculates to 499.

No, the proposition is FALSE.

-99

Two-digit prime numbers whose digits add up to 10 are:193773

It is a table of numbers that are added and the first digit is displayed but if the answer of the 2 number when added is more than 1 digit, you add them again till it reaches a 1 digit number.

lol

If its squared rott is 50, the number must be 2500, which is not a 2-digit number.

Starting with the number just before the "decimal/binary" point and going left: you leave the first digit as it is, add 2 times the digit to its left, add 4 times the digit to its left, add 8 times the digit to its left, and so on to the end. The multiple is doubled each time. If you have digits to the right of the point, you add 1/2 times the first digit add 1/4 times the digit to its right, add 1/4 times the digit to its right, and so on to the end. The multiple is halved each time. The grand total is the equivalent decimal number.

2 digit number