Numbers

It the number can be expressed as a ratio of two integers, in the form p/q where q > 0, then it is rational. However, if you cannot find a way to represent it in this form it could be that the answer has evaded you!

multiple

One number greater than -5 on the number line is -4.

Yes, and the question is ...

Twenty-two and eight tenths.

No, only an infinitesimally small proportion of them are.

The cubes of all rational numbers will be rational. But the cubes of irrational numbers can be either.

No because it can be expressed as a fraction

The answer depends on the units used for 8.23 : clearly the answer will be very different depending on whether you means 8.23 feet, 8.23 micrometres, or 8.23 kilometres, or any other unit for measuring distance.

1, 2, 5, and 10

four and sixty-one hundredths

2 3 5 7 11 13 17 19 23 29 31 37 41 43 47.

Ignore the decimal point, multiply, count the places to the right of the decimal point, then count the same number from left to right in the answer,( after you add if nessicary) And put the decimal there. There's your answer. Example: 5 x 0.2 = 1.0 unusually, the number gets smaller after you add the decimal point.

if a number has an odd number of factors it would be a perfect square

There are 22 numbers (multiples of 4, the smallest number is 4 and the largest number is 88, 4 x 22).

425.52

That is the correct spelling (eight hundred thousandths) for the numeral 0.800 or the fraction 800/1000.

3.78

Yes.

Expressed in figures, this is equal to 720,003.

That isn't possible.

It is: 308/4 = 77

317 is a prime number having only two factors which are itself and one

2, 3, 5, 7

The only such number is zero.