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Precision is how many significant figures have been measured. This is the number of digits in between the first and last non-zero digit. In this case we have: 1265.12 = 6 sig figs 0.71 = 2 sig figs 24.5 = 3 sig figs 54 = 2 sig figs So 0.71 and 54 represent the same level of precision.
135 You're only going to use the first three numbers and the last number is going to be rounded.
The last one has more sig figs than the others.
keep the first four numbers then round up or down the last number. in this case i would keep 3499, then the last 9 would round up, making the number 35000. For only 4 sig numbers, you would have 3500.
A number is divisible by 234 if:its last digit is 0, 2, 4, 6 or 8; andthe sum of its digits (the calculation repeated if required), is divisible by 9; andthe result of nine times the last digit subtracted from the number formed by the rest (the calculation repeated if required) is divisible by 13.