Math 10
Unit 1: Measurement
Lesson notes: 1.1.A Metric or SI Measures of Length.
Name:_____KEY_______
Date:_____________________
LESSON FOCUS: Develop personal referents to estimate Metric measures of length.
In 1976, Canada adopted SI units to measure length. However, construction and
manufacturing industries continue to use imperial units. Many Canadians use imperial units to
measure their height.
We shall save the Imperial units for tomorrow lesson and today we are focusing on SI units.
The SI system of measures is an abbreviation for Le Système International d’Unités. Since 1960,
this form of the metric system has been adopted by many countries, including Canada.
The SI system of measures is generally a system of units of measurement devised around
seven base units and the convenience of the number ten. It is the world's most widely used system of
measurement, both in everyday commerce and in science.
As mentioned earlier that there are seven base units: Each of these base units represents, at least in
principle, different kinds of physical quantities listed in the chart above. From these seven base units,
several other units are derived. In addition to the SI units, there is also a set of non-SI units accepted
for use with SI which includes some commonly used units such as the litre, and it will be discussed
more thoroughly later.
A prefix may be added to a unit to produce a multiple of the original unit. All multiples
are integer powers of ten. Look at the following examples:
1) Example of length:
2) Example of mass: (How much of the stuff?)
Practice.
1) Change 2.75 km to cm____________
2) Change 455 cg to g_____________
3) Change 45 dm to m
4) Change 3.5 hg to g
____________
____________
5) Change 67 mm to m ____________
6) Change 0.005 kg to cg ___________
Practice.
1) 3,689 centimeters (cm) = _____________________ millimeters (mm).
2) 34 meters (m) = ____________________ kilometers (km).
3) 35,679 grams (g) = __________________kilograms (kg).
4) 9,874 hectometres (hm) = ____________________ millimetres (mm).
5) 1,000,000 grams (g) = ____________________ decagrams (dag).
6) 600 millimeters (mm) = ____________________ meters (m).
7) 56,499,000 decigrams (dg) = __________________ grams (g).
8) 3 kilometers (km) = ______________________centimeters (cm).
9) 567 grams (g) = ________________________ milligrams (mg).
10) 345 centimeters (cm) = _______________________ decameters (dam).
How Do You Measure…
Match the correct measuring tool with the item that needs to be measured.
Volume of a cube with 1 cm side is equivalent to 1 cm3, (derived unit) which has a picture like:
Volume of a bigger cube with 1 m side is equivalent to 1 m3, and how many 1 cm3 cubes will fit in the
1 m3 cube?
The litre is a unit of volume. Although the litre is not an SI unit, it is accepted for use with
the SI and has appeared in several versions of the metric system. The official SI unit of volume is the
cubic metre (m3), cubic decimetre (dm3), cubic centimetre (cm3).
******
1 L = 1000 mL.
1 mL = 1 cm3.