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How may two digit-numbers contain the digit 4?
18 positive integers and 36 integers (negative and positive)
How many 4 digit numbers can you make with 5 3 1 7?
256 Each "place holder" if you will, may contain 4 numbers. So it is 4x4x4x4
How many four digit numbers are possible from the digit 0'1'2'3'4 numbers may be repeated?
625 if numbers can have leading 0s, 500 otherwise.
Does an email contain numbers?
It may do.
How may integers between 100 and 800 that do not contain an even digit?
100
What is the greatest six digit number you can write if each digit must be different and no digit may be prime?
Its impossible, there are only 5 single digit numbers that are not prime
How many 7 distinct digit telephone numbers are there if the 1st digit may not be zero?
Nine million of them.
What is standard form of decimals?
The standard form is a string of digits such that the place value of each digit is ten times that of the digit to its right. It may or may not contain a decimal point.
Why do the products of multi digit numbers with zeros and one digit numbers sometimes have zeros in them and sometimes have no zeros in them?
The product may not have any zeros if there are "carries" from a product at a lower level.
How many 3-digit numbers can be made using the digits 2 3 7 9?
-- If the same digit may be repeated, then 64 can be made. -- If the same digit may not be repeated, then 24 can be made.
An orbital may never contain what?
An orbital may never contain 3 electrons. An orbital will contain at the most 2 electrons which have different quantum numbers.
Did Cardiff telephone numbers ever have only five digits?
Prior to the conversion to area code 029 with 8-digit local numbers in the Big Number Change in 2000, Cardiff was area code 01222 with 6-digit local numbers. If you go back in time, it is quite likely that Cardiff had 5-digit local numbers, and may also have had a mix of 5- and 6-digit numbers for some time.
