The digit 7 in the number 71 is in the tens place. In a two-digit number like 71, the rightmost digit is in the ones place and the leftmost digit is in the tens place. Therefore, the place value of the digit 7 in the number 71 is 70, which represents 7 tens.
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First 9 pages = 9 digit. That leaves 142 digits. @ 2 digit per page, that is 142/2 = 71 pages with 2-digit numbers. So, 9 pages with 1-digit numbers + 71 pages with 2-digit numbers = 80 pages.
When rounding 70.9 to the nearest whole number, you look at the digit in the tenths place, which is 9. Since 9 is 5 or greater, you round up the whole number. Therefore, 70.9 rounded to the nearest whole number is 71.
0.0114
85
79 because each number in the sequence is generated by adding the value of the numerals in the previous number to the previous number, so 7 + 1 = 8 and added to 71 = 79.