It's time for mathematics, people!

Mathematics (Form 4)

Chapter 1 - Standard Form

Question:

Round off 365 444 correct to three significant figures.

Solution:

365 444 (Count 3 from the left-hand-side)

Then, look at right beside value 5 which is 4 (4 is less than 5)

So, no need to add 1 to value 5.

Thus, the answer is 365 000.

Question:

Round off 123 567 correct to three significant figures.

Solution:

123 567 (Count 3 from the left-hand-side)

Then, look at right beside value 3 which is 5 (value is equal or greater to 5)

So, need to add 1 to value 3.

Thus, the answer is 124 000.

Question:

Express 0.0000987 in standard form.

Solution:

0.0000987 (count from the (.) to after value 9 which is 5)

9.87 x 10^-5  (-ve means the counting is to the right)

Thus, the answer is 9.87 x 10^-5 .

Question:

Express 3.41 x 10^-2 in single number.

Solution:

3.41 x 10^-2 (count 2 from the (.) to the left – because the negative sign)

0.0341 (single number)

Thus, the answer is 0.0341.

In this chapter 1 (Standard form) we have to know the difference between significant figure & decimal points, standard form & single number.

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