We have recently begun a new math unit exploring numbers to 20. One of the major concepts we have tackled is subitizing. Subitizing is being able to look at a group and know how many are there, without having to count each individual item. In short, subitizing is "instantly seeing how many". We subitize when we roll a dice. You didn't have to count the dots to know you rolled a six, right?
We have really enjoyed the challenge of playing different games to practice our subitizing.
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| Subitizing BINGO |
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| Enormous Snakes and Ladders using a set of subitizing cards rather than dice |
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| Memory |
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| Interactive games on the SMARTboard |
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| Kaboom! (based upon the traditional card game "war") |
Subitizing helps us see patterns, identify relationships between numbers, and understand place value. We have subitized using a tool called a ten-frame. Ten-frames are two rows of five boxes, and can help us see how numbers relate to five and ten. Here is a ten-frame:
We made a giant ten-frame and filled it with crazy kids to show the numbers 1 through 10:
Ten-frames will also support us as we explore addition and subtraction in the coming weeks, and we can even put two ten-frames together to work with numbers to 20.
Are you up for a challenge? Play the subitizing game below. Can you quickly say how many dots there are on the ten-frame? Here is a hint: sometimes the empty frames can help us know how many frames are actually full. Careful, it's fast!
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