Many of you are using Number Talks, Ten Frames, Rekenreks, and other tools and strategies to help your children to subitize. Subitizing is the ability to tell the number of objects in a set, quickly, without counting. Subitizing helps student to develop a better number sense. It’s important for them to develop a good number and flexibility with numbers so they will find mental computations easier. For example, if a child is able to visualize what 3 looks like, either with a ten frame or a rekenrek, then that child also “sees” that 7 more are needed to make ten. They “see” this because they are able to “see” in their mind’s eye that there are 2 and 5 more that are needed.
Being fluent in their sums of ten is critical because we are typically dealing with a base-ten number system. Playing SUM OF WHICH gives a player time to think about how to make in a variety of ways. Allowing use of a ten-frame(s) and counters can be helpful when playing SUM OF WHICH is TEN and SUM OF WHICH is TWENTY. Base Ten Blocks are very helpful to a child playing SUM OF WHICH is 100. The Rekenrek is great for all three of the previously mentioned. When players are playing SUM OF WHICH is ONE with the fractions, I encourage use of the templates that come filled with the tiles for the game. Cut them into 2 by 8 arrays so players can use them much the same way as they used the ten-frames. However, now one cell is 1/16 of the whole. Two cells make 1/8 of the whole. Four cells are equivalent to ¼ of the whole and 8 make ½ of the whole. Bar models can also be used when playing SUM OF WHICH is ONE. It’s amazing at how good players get at estimating the sums of the fractions after playing SUM OF WHICH is ONE.
During the month of February, I want to make “SWEET DEALS” with you. The Primary and Upper Elementary Bundles are on sale. I am also introducing the “Big Bundle” at a reduced price. Finally, I am offering a reduced price when you buy two copies of SUM OF WHICH. Go to sumofwhich.com and check out the savings. SMART Notebook files are also now available for all SUM OF WHICH games with a reduced price when getting more than one version. They are a great way to teach the game or use as an electronic math station.
Be sure to think ahead. What will you do to celebrate the hundredth day of school? Playing SUM OF WHICH is 100 is a wonderful idea. Pi Day Tournaments playing SUM OF WHICH are also a great hit with children. Contact me if you are interested in more information.