7.1
Do not make the mistake of rounding to 7.15 and then 7.2
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34.2497 rounded to 1 decimal place equals ... 34.2! I think ^.^
6.9
21.2
1 mm = 1000 micrometre is written as a decimal. To write a number as a decimal only requires that the place value of each digit is ten times the place value of the digit to its right. The number may or may not have a decimal point, it may or may not have a fractional part.
To write 16.0917 correct to 1 decimal place, you round it to the nearest tenth. In this case, the tenths place is 9, which is larger than 5, so you round up. Therefore, 16.0917 rounded to 1 decimal place is 16.1.