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You and I can recognize the numerosity, the number of things, instantly by just looking. If you haven’t learned the names of the first ten numbers, starting with zero, then these exercises are great as it develops your natural instincts. If you already know how to count then these exercises can help you learn a quicker, more natural way, to number things.
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Subitizing
How many?
Can animals count?
Five Animals Who Can Count 1. Chimpanzees 2. Robins 3. The domes<c chicken 4. Rhesus monkeys 5. Ants 6. …and many more
hEp://www.care2.com/causes/5-‐animals-‐who-‐can-‐count.html?page=1
Can animals subitize?
hEp://www.youtube.com/watch?v=HfoQEUm4drk hEp://www.youtube.com/watch?v=ZnqUAsyOTv4#t=162
Fish can choose the right amount of shapes displayed over a hole to get their treats in a
path.
Crows know that danger s<ll lurks if one human goes behind a screen and doesn’t
come out.
Objects needed: • A number of identical things
of different colors.
• A sheet of construction paper or cardboard.
Discovery 1
Can you subitize?
Can you subitize?
Can you subitize?
Can you subitize?
Which numbers did you always get right?
Examples only. Random means no order.
Does the research hold?
Did it get harder and take longer when there were more ?
Excerpt from Dehaene, S. (1997). The number sense: How the mind creates mathema4cs. Oxford University Press.
House Hunt
Discovery 2
Can you subitize?
Can you subitize?
Can you subitize?
Can you subitize?
Which numbers did you always get right? Did organizing
make it quicker?
Examples only. PaEerns may differ.
Were these random or organized in this
graph?
Did your response
<mes change when you organized?
Excerpt from Dehaene, S. (1997). The number sense: How the mind creates mathema4cs. Oxford University Press.
Discovery 3
Discovery 3
Discovery 3
Discovery 3
Words/Concepts
Subi2zing Webpages Ac2vi2es
• Dot Cards – hEp://www.slideshare.net/khrycan/dot-‐cards
• Subi<zing Videos – hEp://www.slideshare.net/khrycan/dot-‐cards
• Coun<ng Challenge – hEp://www.intmath.com/numbers/coun<ng-‐
game.php
• Count the Dots – hEp://news.bbc.co.uk/2/hi/uk_news/6577241.stm
• Pre-‐K Pages -‐Games – hEp://www.pre-‐kpages.com/subi<zing/
• Domino Game – hEp://michellef.essdack.org/?q=node/127
References • What is Subi<zing?
– hEp://www.coun<ngtogether.com/educators.htm
• Subi<zing Defini<on – hEp://www.kensmath.com/kens-‐math-‐program/
subi<zing/
• Number Sense – hEp://specialed.about.com/od/mathfounda<ons/
a/Subi<zing-‐A-‐Skill-‐That-‐Leads-‐To-‐Strong-‐Number-‐Sense.htm
• Be wise...Subi<ze – hEp://mathcoachscorner.blogspot.com/2012/01/be-‐
wisesubi<ze.html
And many more…