Question

B) Write 2.456 correct to 2 significant figures

Answer 1

Answer:

it should be 245.6

Step-by-step explanation:

since it was 2decimal place we move the point 2times forward and it becomes 245.6

Answer 2

Answer:

  2.5

Step-by-step explanation:

When the number is rounded to two significant figures, the left-most digit will be non-zero, and there will be one more significant digit to the right of it.

Here, we need to round the number to 2 significant figures. Find the third digit from the left. If it is 5 or more (it is), then increase the second digit from the left before removing all digits to the right of it.

  2.456 rounds to 2.5

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Additional comment

Leading zeros are never significant. Trailing zeros are only significant if the number has a decimal point. Any digits between leading and trailing zeros are significant. All mantissa digits of a number in scientific notation are significant.

When rounding to a specific number of significant digits, as here, the significant digits are counted from the left.