Knowing how to correct to decimal places will make any exam question on decimals become a bonus question to you.
In this tutorial, you will learn the key features of decimals and how to correct to any decimal place in your exam.
BONUS: A link to real past questions on decimals is included at the end of this tutorial.
1. Meaning of Decimal
A decimal is another form of fraction. It is written in numbers to the right and left of a point called decimal point.
Numbers before the decimal point are whole numbers while the numbers after the decimal point are fractions.
Numbers after the decimal point are pronounced one by one.
13.580 is pronounced as ”Thirteen” point ”Five” –”Eight” –”Zero”
And NOT, “
Thirteen” point “Five hundred and Eighty.“
2. Correcting to Decimal Place
A decimal place, also known as (d.p) refers to the total amount of numbers that are after the decimal point.
Any question on decimal place is just the examiner simply saying that he/she wants to see ONLY the given amount of numbers after the decimal point.
Correct 13.580 to 1 decimal place.
The question above is in 3 decimal places because there is a total of three numbers after the decimal point. Take note that no matter their positions, Zeros after the decimal point are counted in decimal place.
Now to correct to 1 d.p, you have to round off the numbers after the decimal point until only one number is left.
13.580 (Three numbers left)
=13.58 (Two numbers left)
FINAL ANSWER =13.6 (One number left)
5 changed to 6 at the end because the rule of rounding off states that numbers from 5 and above are rounded up to 1 while numbers from 4 and below are rounded down to 0.
Summary on Decimal Place
ONE MORE EXAMPLE: Correct 0.00630427 to 2 decimal places.
=0.0063043 (correct to 7 d.p)
=0.006304 (correct to 6 d.p)
=0.00630 (correct to 5 d.p)
=0.006 (correct to 3 d.p)
=0.01 (correct to 2 d.p)
- Decimals are fractions
- Whole numbers to the left.
- Fractions to the right.
- Numbers after the decimal point are pronounced one by one.
- Decimal place is counted after the decimal point.
- All the Zeros, no matter their positions after the decimal point are counted in decimal place.
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