Is 6.1 or 6.18 bigger and how you know which one is larger.

  6.18 is larger

Step-by-step explanation:

Written with an equivalent number of decimal places, we are comparing ...

  6.10

  6.18

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Use these rules for comparison of positive numbers:

1. If the left-most non-zero digits are in number places with different place values, the one with the digit in the highest place value is larger.

2. If the left-most non-zero digits are in number places with the same place value, the number with the larger digit is larger.

3. If the left-most non-zero digits are in the same number place and have the same value, replace those digits with 0, and repeat the comparison starting with the first test above. If one of the numbers has no more non-zero digits, use zero. If both of the numbers have no more digits, they are equal--neither is larger.

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Following the above rules, we compare the units digits to find they are the same.

Then we compare the tenths digits, and find they are the same.

Then we compare the hundredths digit of 6.18 to 0 to find that 8 > 0, so 6.18 > 6.1

Alternatively (for numbers of any sign), subtract one number from the other. If the result is positive, the minuend is larger. If the result is negative, the subtrahend is larger. If the result is zero. the numbers are equal.