Page 110 - Math Smart - 7

CHAPTER 5.1

In this chapter
etrlc Units
Pupils should be able to:
• know abbreviations for
metric units
Scientists and mathematicians can use measurement to describe the quantity of
• know relationships
something. Quantity is a measure of how much there is, or how many there are.
between metric units,
You want to buy a laptop bag for your laptop. You have seen two laptop bags in a
and convert between
shop. Which bag would you buy? Why?
metric units
What about the other items that you need to carry in your bag? Will they fit?
^ Thlrtt^d Sfii!
^ RECALL

Did you think to start by measuring the |
Convert these
dimensions of your laptop?
measurements.
Think about 260 mm
O 10.5 cm =
• what instrument you would use to I
measure with, t
• which dimensions you would measure
kg
and
• which unit of measure you would use.
kg 378 mm

Once you knew the dimensions of the laptop, did you think to measure the
O 12i59ml=: dimensions of the two laptop bags?

B

35 cm 47 cm
Did you notice that the
unit of measure of the
laptop is millimetres,
and the unit of 24 cm
32 cm
measure of the laptop Solution
bags is centimetres? Convert the unit of measure of the laptop to centimetres:
It is easier to compare
Dimension Laptop Laptop bag A Laptop bag B
dimensions when the
Width (cm)
same unit of measure
is used —think about Height (cm)
what you can do to
You need to buy laptop bag because neither the height nor the width
solve this problem.
of the laptop bag is big enough to fit the laptop.