## Subitizing Part 3

Subitizing (also known as quick images) is a very important routine for k/1 classrooms. Here are some more great links about this! This is a great routine to do in whole group as well as small guided math groups. In small guided math groups you get to have more individual conversations and hear student thinking.

**Links**

Link 2 (a variety of games)

Link 3 (great article)

Link 4 (powerpoints and more)

Be sure to check out my subitizing pinterest board as well!

Happy Mathing,

Dr. Nicki

**Read Full Post**|

**Make a Comment**( None so far )

## Subitizing and Guided Math Groups: Part 2 Why it is so important!

Subitizing provides a basis for early addition skills. Different arrangements help children to see and discuss different ways to name a number. Ten frames are another tool to use to build subitizing skills. Subitizing is a fundamental skill in the development of students’ understanding of number (Baroody, 1987). Clements (1999) writes that students can use subitizing to develop understanding of number, conservation and compensation.

Here are some game ideas. There are several others listed in the links below. When you show your students the cards you should ask “What do you See?” This is different from “How many? because it frames the question in a way that they think about different number arrangements. More question examples http://naturalmaths.com.au/numblocks/mr_subitization.htm

1. Quick image games where the teacher flashes dot cards and the students tell how many.

2. Give children a set of cards with equivalent names but one that doesn’t belong. Have them select the one that doesn’t belong.

3. Have students match the number with the dot card.

4. Have the students play matching games with cards that show equivalent names.

**Great Resources for Subitizing:**

There is a new video out by Marilyn Burns called Number Talks that shows a teacher using dot cards and ten frames.

http://teachmath.openschoolnetwork.ca/Subitizing.htm

http://www.moviemakers.ca/downloads.php

http://www.acoe.org/acoe/files/EdServices/Math/NumberRecSubitizingV3.pdf

http://www.k-5mathteachingresources.com/support-files/dotcards1-12.pdf

http://www.k-5mathteachingresources.com/support-files/large10frames1-10.pdf

http://www.k-5mathteachingresources.com/ten-frames.html

**References**

http://en.wikipedia.org/wiki/Subitizing

http://teacherweb.com/wa/nachesvalleyprimaryschool/msclark/Subs.PDF

**Read Full Post**|

**Make a Comment**(

**1**so far )

## Subitizing and Guided Math Groups: Part 1

Subitizing is being able to look at a number and know how many without counting. It refers to “rapid, accurate and confident judgments performed for small numbers of items. It comes from the Latin adjective subitus (meaning “sudden”)” and has to do with immediately knowing how many items one sees for a small set of numbers. When we are talking about larger sets we often estimate or count.

There are two types of subitizing. *Perceptual subitizing* is looking at the number and knowing how many without any mathematical processes taking place. *Conceptual subitizing *is based in mathematical processes, such as looking at the parts and the whole. An example of this iswhen you see the eight domino and you know that it is five on one side and three on the other and that makes eight. Spatial patterns are just one kind. Other patterns include kinesthetic ones such as finger patterns, rhythmic and spatial-auditory (Clements, 1999).

We usually teach students to subitize up to ten. See http://www.poweroften.ca/index.php?option=com_content&view=article&id=37&Itemid=103

Spatial arrangements make subitizing easy or hard. Rectangular arrangements seem to be the easiest followed by linear, circular and scrambled arrangements increasing in difficulty (cited Clements, 1999). You can use dot cards, domino cards, number-cube cards and ten frames to teach subitizing. You can also use bingo chips and interlocking cubes.

**Subitizing is a fundamental skill **in the development of students’ understanding of number (Baroody, 1987). Clements (1999) writes that students can use subitizing to develop understanding of number, conservation and compensation. In part 2 we will discuss this further.

**Resources**

http://mathelem.sites.fcps.org/system/files/kordeliasGame.pdf

**References**

http://en.wikipedia.org/wiki/Subitizing

http://teacherweb.com/wa/nachesvalleyprimaryschool/msclark/Subs.PDF

**Read Full Post**|

**Make a Comment**(

**2**so far )