Q: How many two digit numbers are there in which the sum of the digits is greater than their product?

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You had me until "product." The product of 4 digits can't be prime.

The 2-digit number must be 20, because it is the only 2-digit number whose sum of its two even digits, 2 + 0 = 2, is greater than the product of its two even digits, 2 x 0 = 0. Moreover, 20 is a product of the two consecutive integers 4 and 5.

There are 15 of them.

There are three such numbers: 12, 24 and 36.

If the question is about the product of all odd digits, the answer is 945. Otherwise the question does not make sense.

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If you mean, "What is the largest number of digits possible in the product of two 2-digit numbers" then 99 * 99 = 9801, or 4 digits. Anything down to 59 * 17 = 1003 will have 4 digits.

You had me until "product." The product of 4 digits can't be prime.

It can have 4 digits, because the highest possible two digit numbers 99*99=9801.

The 2-digit number must be 20, because it is the only 2-digit number whose sum of its two even digits, 2 + 0 = 2, is greater than the product of its two even digits, 2 x 0 = 0. Moreover, 20 is a product of the two consecutive integers 4 and 5.

There are 15 of them.

from 3 digits (10x10) to 4 digits (99X99)

-21

There are three such numbers: 12, 24 and 36.

4 Give examples to support your answer please.

A positive number is greater than a negative number. If a positive number is greater than another, the corresponding negative numbers are smaller. For example, since 4 > 3, -4 < -3. For two positive numbers: The number with more digits is greater. If they have the same number of digits, the number with the greater first digit is greater. If they are equal, look at the second digit, which will decide which number is greater, and so forth, up to the last digit. For example, 12500 is greater than 12480: they have the same number of digits, the first two digits are the same, but the third digit is the tie-breaker. For numbers with decimals, first apply the rules above for the whole part. If they are equal, check the first digit after the decimal point, then the second, etc., until you find a "tie-breaker". For example, 0.2522 is more than 0.2517. Once again, the first two digits are the same, the third is the tiebreaker.

If x - y > 0, then x is greater than y.The greater positive number is the one further from zero.Which number is greater can be worked out on a digit by digit basis:To compare numbers starting with the highest place value column compare the digits, moving right a place value column until either all digits have been considered or one digit is higher than the other - the number with the higher digit is the greater number. (If a place value column is empty, its digit value is 0).

There are five such numbers: 11, 12, 15, 24 and 36.