Drafting lesson

1. E Q U A T I O N A P P
• Comparing decimals by
using a place value chart
• Comparing decimals by
using symbols
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2. G R A D E 7
MECHANICAL DRAFTING

3. Any rational number can be
changed from fractional form
to decimal form. This is done by
simply dividing the numerator
by the denominator.

4. C.
Illustrative
Examples
A.
B.

5. Illustrative
Examples
A.

6. Metric measurements in decimals are
often long numbers. They must often be
rounded off to a convenient number of
digits. In this text, most metric dimensions
are either whole millimeter or two-places
decimals that have been rounded off.
Rounding Off Decimals

7. If the first number to be eliminated is less than 5, simply drop it
(and the number to the right of it) and let the last significant
digit stand.
Round off 25.4 mm to whole millimeter.
Solution: Simply drop the .4
Answer: 25
EXAMPLE:
Round off 0.3125 into two significant digits.
Solution: The first number to be eliminated is 2:
Simply drop it and all numbers to its right(5)
Answer: 0.31
EXAMPLE:

8. If the number to be eliminated is 5 or more, drop the number,
then add one to the last digit retained.
Round off 78.6 into its nearest ones.
Solution: The number to be rounded off is 6 which is greater than 5,
drop 6 and add one to the last digit retained.
Answer: 79
Round off 92.65 into its nearest tenths.
Solution: The number to be rounded off is 5, drop 5 and add one to
6 which is the last digit retained.
Answer: 92.7
EXAMPLE:
A.
B.

9. A decimal is changed to a fraction by using 10 or any power
of 10 as denominator of the given decimal. Then reduce to
lowest term when possible.

12. Look at the place values, the
further the digit is to the left,
the greater is its value.

13. Mathspace. ‘Compare numbers with decimals in tenths or hundredths
| Grade 4 Math | UK Primary (3-6)’. Accessed 7 December 2023,
https://mathspace.co/textbooks/syllabuses/Syllabus-
452/topics/Topic-8354/subtopics/Subtopic-
109887/bookType=textbook&searchString=&activeTab=theory

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