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Add the digits together. The sum of the digits of 23 is 5.

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Add the digits together. The sum of the digits of 23 is 5.

This problem can be solved by applying the counting principle to digits in consecutive page numbers. To begin, we need to separate numbers into their numbers of digits in order to multiply the page numbers to find the number of digits needed to express them. Assuming that your book begins on page 1, there are 9 page numbers having one digit only (counting principle: 9 - 1 + 1 = 9). Since each of these pages is numbered with one digit, the number of digits used is 9 so far. Continue with the pages each numbered with two digits. These are pages 10-99, comprising 90 pages (99 - 10 + 1 = 90). Every page number multiplied by 2 digits each is 180. With the 9 digits coming from single-digit pages, the number of digits used so far is now 189. We can continue in the same manner for pages expressed with three digits, 100-999, but having 435 (624 total - 189 so far = 435) digits left, we probably won't be able to get through all the three-digit numbers. Also, a book is likely to have under a thousand pages. To find out how many pages are left, we divide the number of digits left by the number of digits needed for each page: 435/3 = 145 pages left. Since 145 pages only account for the pages numbered with three digits each, we need to add pages numbered with one and two digits each in order to find the total number of pages. Before 145 pages began to be accounted for, we had accounted for the digits of 99 pages (each numbered using one or two digits each), so the total number of pages is 99 + 145 = 244.

Hey mate, its on the box itself just above the barcode (10 digits)

100000 2847239582

the sum of individual digits of a given integer number

It is the number of combinations of four numbers where the number of available digits starts at 10 and reduces by 1 each time.

The no. is 35.

Any number using each of the digits once will be a multiple of 3: eg 1597864302

45

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

26

There are about 10-11 digits in a number

You need to add up the number of digits to the right of the decimal to find the number of digits in the answer. If the first factor has 2 digits to the right of the decimal point and the second factor has 3, the final answer will have 5 digits to the right of the decimal point.

13 + 33 + 53 = 1 + 27 + 125 = 153.So the three digits are 1, 3 & 5.

45

34.

maths

You can find it on the left side of the size of the tire. It will follow the DOT number in a square and made of 4 digits. First two digits are the number of weeks and the second two digits are the year of manufacturing.

45

the answer is 25 and then if you reverse that it is 52

The last digit is always the estimated digit in a number

192

To assess the number of significant digits in a number, you first have to find the greatest non-zero digit. In this case it is the first five which represent 500. The next step is to simply count how many digits there are after this number. In this case, there are 4 more digits. Thus the number 500.95 has been given to 5 significant digits.

You need to count off four bits at a time, from the right (this is in case the number of binary digits is not an exact multiple of 4). Then you replace each group of four binary digits by the hexadecimal equivalent. You can easily find a table of conversion online.

Find a four digit number whose digits will be reversed when multiplied by nine?