Q: Give the number 142.29 to 2 significant figures?

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If you are looking at this from a maths perspective, the 'significant figures' are the number of digits counting from the first non-zero digit, so the number of significant figures in 10.0 is three. You may be asked a question, and told to give the answer 'to three significant figures'. This would mean the answer would look something like '12.2' or '0.0254'. This is in contrast to decimal places, which refer to the number of digits after the decimal point. For example, the number 10.0 is quoted to one decimal place.

That's 6. You count all the numbers but the last "0", as you don't need to have that to give the same result. 87.558 is the same as 87.5580

Adding numbers using only the significant digits can introduce inaccuracies, for example if you are adding pi ten times using 4 decimal places of pi the answer is 31.416 but the right answer is 31.4159 . . Subtracting can give quite bad errors especially when two nearly equal numbers are subtracted. So for subtraction it's best to use more significant figures and round the answer to the required number of digits afterwards.

I would use grams because grams would give you more significant figures for the measurement than kilograms

A decimal number is simply a way of representing a number in such a way that the place value of each digit is ten times that of the digit to its right. A decimal representation does not require a decimal point. Adding zeros after the decimal point is wrong because they imply a degree of accuracy (significant figures) for which there is no justification.

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0.00684 has three significant figures The product of 7.6 x 1.246321 has two significant figures. 28623 has five significant figures. 1.20000 x 10-19 has six significant figures. Trailing zeroes after a decimal point are considered significant. In scientific notation, only the numbers before the multiplication symbol are considered significant.

There are two significant figures which are the two 2s.

George Washington and Thomas Jefferson were significant figures in American history.

In the number 345, the significant figures are 3, 4, and 5. In the number 0.00234, the significant figures are 2, 3, and 4. In the number 7000, the significant figures are 7, 0, and 0 when written in scientific notation as 7.00 x 10^3.

14525 has 5 significant figures (s.f) significant figures help mathematicians to summarise their answer for example to give an approximation if 3 significant figures was required then the answer would be 14500 if you were asked to give 1.1235678 to 4 s.f. then the answer would 1.124 (rounding up the last digit). I hopes this help

If you are looking at this from a maths perspective, the 'significant figures' are the number of digits counting from the first non-zero digit, so the number of significant figures in 10.0 is three. You may be asked a question, and told to give the answer 'to three significant figures'. This would mean the answer would look something like '12.2' or '0.0254'. This is in contrast to decimal places, which refer to the number of digits after the decimal point. For example, the number 10.0 is quoted to one decimal place.

Non-zero numbers are always significant and leading zeros are never significant. So 0.007222 has 4 significant figures so rounding to 3 would give you 0.00722.

That's 6. You count all the numbers but the last "0", as you don't need to have that to give the same result. 87.558 is the same as 87.5580

8.235

Three. All non-zero digits are significant, as are zeroes between them, and zeroes after a decimal point. The entire question about sigfigs is "what digits can you be confident are not rounded off?" The answer is three because you cannot prove that this is not rounded to the nearest hundred. You can only be sure that the three digits (405) are all correct and even the 5 might be rounded off. If it were 40500.0, then all six digits would be SigFigs because that is showing exactness. ■