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# SUBITIZING

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SUBITIZING
Got ten minutes to go before that last bell and lost for what to do to keep students busy? Well, this pack of 140 Subitizing cards can be a time filler.

Subitizing is the ability to look at a number of items in a small set and identify the amount without counting each one individually. Educator, Douglas H. Clement in his article, “Subitizing: What is it? Why teach it?” , states that students who develop the ability to subitize show improvement in overall math skills, especially addition and subtraction skills.

So get your students to not only use perceptual subitizing whereby they quickly identify the number of items in a set by perceiving that four dots are more than three dots for example, but are also able to use conceptual subitizing that involves the ability to combine small set of numbers or number combinations, for example, six dots and two more make eight in all.

HOW TO USE
Show each card briefly for less than 3 seconds. Students should look at the arrangement of dots and patterns to identify the number. The idea is not to count each dot individually, but look at the items as a whole and determine the number. Explicit training is required so eventually students can combine numbers to find out the sum of two sets of numbers.

* Students can also play with each other in small groups. One student shows a card and the quickest to answer keeps the card. These cards can also be placed in your math centers.

* Your students can also play 'Around the World' - instructions in file.

WHAT’S INCLUDED
SUBITIZING NUMBERS 1-5
SUBITIZING NUMBERS 6-10
SUBITIZING NUMBERS 11-15
SUBITIZING TEN FRAMES 1-5
SUBITIZING TEN FRAMES 6-0
SUBITIZING TEN FRAMES 11-15
SUBITIZING TEN FRAMES 16-20

** Cards are marked with different color backgrounds and dots for each section. You may mark each section behind each subitizing card to differentiate if you like.

CATERING TO DIFFERENTIATION
The cards in this pack range in complexity in terms of number and arrangement of dots in a set. Cards that use perceptual subitizing feature less number of dots that are more spread out in a line or rectangle, while cards that require students to use conceptual understanding feature dots that are more tightly arranged in a linear arrangement or placed in a circle. For older students, cards can be shown for a fraction of a second. Research shows that with practice, students will develop the ability to subitize and eventually demonstrate increased arithmetic skill.

COMMON CORE STANDARDS
Kindergarten:
Counting and Cardinality(K.CC.1, K.CC.4,K.CC.5),Operations and Algebraic Thinking (K.O.A.3), Number and Operations in Base Ten (K.NBT.1)First Grade: Number and Operations in Base Ten (1.NBT.1, 1.NBT.5), Operations and Algebraic Thinking(1 O.A. 1, 1 O.A. 4, 1 O.A. 8)Second Grade: Number and Operations in Base Ten (2.NBT.2), Operations and Algebraic Thinking (2.O.A. 1)
Third Grade: Number and Operations in Base Ten (3.NBT.2)
Fourth Grade: Operations and Algebraic Thinking (4.O.A.5), Number and Operations in Base Ten (4.NBT.4)
Fifth Grade: Operations and Algebraic Thinking (5.O.A.3)

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All rights reserved by author. Permission to copy for single classroom use only. Electronic distribution limited to single classroom use only. Not for public display.

TAGS
number sense | number sense game | number sense games | number sense task cards | number sense cards | subitizing | dot cards | subitizing game | subitizing cards
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