3347
The number digits for twelve and four-tenths = 12.4
Because this number does not have a decimal point, to count significant digits, we start at the right and start counting from the first non zero number. The first non zero number is 6 and this number has 4 significant digits.
There is no such number. If the four digits are even, the entire number is even, not odd.
insert a leading number 0
five digits number when you multiply by four is the same the number when you reversed it is 21978*4 = 87912
All four of the digits given are significant digits.
If the last two digits of a number are divisible by four, the whole number is divisible by four.
15 digits (the first four digits is the branch code)
1,071 has four significant digits.
(Page 44) Insert a leading number 0
enter the last four digits of your cell phone number
9,999,876 is the greatest seven-digit number using four different digits.