Question

Write 168.9 correct to 2 significant figures.

Answer 1

Answer:

170

Step-by-step explanation:

Answer 2

SOLUTION

TO DETERMINE

Write 168.9 correct to 2 significant figures

CONCEPT TO BE IMPLEMENTED

Rule for rounding off a number :

Discard all digits to the right of the nth place , if the discarded number is less than half a unit in the nth place , leave the nth digit unchanged ; if the discarded number is greater than half a unit in the nth place , add 1 to the nth digit .

If the discarded digit is exactly half an unit in nth digit leaving the nth digit unaltered if it is an even number but increase it by 1 if it is an odd number

EVALUATION

Here the given number is 168.9

We have to write 168.9 correct to 2 significant figures

2nd significant digit = 6

3rd significant digit = 8

Now 8 > 5

So we have to 1 with 2nd significant digit

Hence writing the given number correct to 2 significant figures we get 170

FINAL ANSWER

Hence the required number = 170

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