Fractions and decimals
All numbers between negative one and zero are negative. When you multiply a number by a negative it becomes negative. Also, all numbers between negative one and zero are decimals. When you multiply a number by a decimal it becomes smaller. Thus, when you multiply a rational number by a number between negative one and zero, it becomes smaller and negative.
Once again, if you're talking about whole numbers, then negative integers and zero. But since fractions and decimals are numbers, and are not integers, anything between negative infinity to 1 are before one. So fractions and/or decimals between 1 and zero, such as 1/2, 0.9, and anything between negative infinity and zero, such as -1024, -6/13, 69.029.
1
One of the numbers being zero makes no difference.
25
There are an infinite amount of numbers between zero (0) and one (1).
Fractions and decimals
Answer: There are six. Answer: There is no such thing as "significant numbers". I assume you mean "significant digits". All digits are significant in this case - a zero (or more than one zero) between other digits is always significant.
Infinitely many. In fact, between any two different real numbers, there are infinitely many rational numbers, and infinitely many irrational numbers. (More precisely, beth-zero rational numbers, and beth-one irrational numbers - that is, there are more irrational numbers than rational numbers in any such interval.)
All numbers between negative one and zero are negative. When you multiply a number by a negative it becomes negative. Also, all numbers between negative one and zero are decimals. When you multiply a number by a decimal it becomes smaller. Thus, when you multiply a rational number by a number between negative one and zero, it becomes smaller and negative.
3, one of the rules is counting the Zero between none zero numbers
90 of them.
Once again, if you're talking about whole numbers, then negative integers and zero. But since fractions and decimals are numbers, and are not integers, anything between negative infinity to 1 are before one. So fractions and/or decimals between 1 and zero, such as 1/2, 0.9, and anything between negative infinity and zero, such as -1024, -6/13, 69.029.
One or both of the numbers must be zero.
10
All the numbers from 100,000 to 111,111 contain a zero, so that is 11,111 numbers already. The question is then how many numbers between 1,111 and 2,000 contain at least one zero. There are 19 numbers every hundred digits from 1,200 onwards that meet this requirement (10 which have a 0 in the tens and ten which have a 0 in the units, not counting 00 twice) and thus we have 19x8 = 152 additional numbers. Add this to the amount from before, and 1 for the end value of 112,000: 11,111+152+1 = 11,264 numbers.