Page 119 - Math Smart - 7

CHAPTER 5.3

In this chapter
Reading Scales
Pupils should be able to:
• read the scales on a
range of analogue
and digital measuring Measuring instruments are used to measure physical quantities such as length,
instruments mass and capacity. They can display the measurement in analogue or digital form.

Length Mass Capacity
^ RECALL C

a
O Use your ruler to find Analogue
the length of the
eraser.

I tape measure mass meter measuring jug

The length of the
eraser is cm. Digital

© Find the mass of the
chicken.
To find the length, mass or capacity using an analogue measuring instrument, you
read from a scale. To measure these physical quantities on a digital measuring
instrument, you read the measurement directly from the digital display.
The scales on analogue instruments are number lines. Scales may be straight or
curved.
% '
I'joo U *" 200
To read a measurement on an analogue scale, work out the interval. Use the
interval to read the measurement indicated.
50(H

I'M 1000 Example 1
JIM
Read the measurement shown on the scale.
The mass of the chicken is

O To work out the exact mass
shown, you need to work
grams
This scale must be read out the interval of the scale.
in a clockwise
Count the number of spaces
direction.
between two long lines.
There are 5 spaces between
The mass shown
is between 600 g two long lines.
and 700 g.
100g-r5 = 20g
Each interval of the scale
represents 20 g.
@ The reading on this scale is 640 g.