Ratios
Objective – an introduction to ratios.
Keywords: equivalent, simplest form and symbol :
13 April 2015
Mr Armstrong
Mr Armstrong has a problem. He needs
to decorate a room pink, but only has red
and white paint!
W
R
In pairs think where you would place
your paint mixture on the washing line!
W
R
Launch Pink Paint Program
Ratios – compares the size of one part to
another.
2:1
3:2
A fraction shows what proportion of the
whole shape is shaded.
Ratios – compares the size of one part to
another.
2:1
3:2
On your number cards write down the
ratio of red to white tins of paint.
Order your cards in the order of shades
of pink. If you have the same shade of
pink then place the card below each
other.
W
R
W
R
Would you make any changes to the
washing line used at the start of the
lesson?
What would you now do differently if you
were to do the task again?
What did you learn?
W
R
W
R
Play Ratio Speed Challenge on:
http://mrarmstrong.eu5.org/ratio
• Practice your ratio skills.
• Check you understand
simplest form.
• Support for understanding.
• Try and top the scoreboard
(beat your friends!)
Equivalent Ratios – the same ratios!
We could write the number of black dots
to white dots as ratio…..
6:2
Also for every 3 black dots there is one
white dot.
3:1
The ratio with the lowest possible whole
numbers is called the simplest form!
Equivalent Ratios – the same ratios!
We could write the number of black dots
to white dots as ratio12
______
:3
The simplest form is _______
4:1
Ratios
Objective – an introduction to ratios.
Keywords: equivalent, simplest form and symbol :
13 April 2015
Mr Armstrong
Thank you for your attention!
Rat-ios
Play Ratio Speed Challenge on:
http://mrarmstrong.eu5.org/ratio