If you walk into almost any elementary/primary school mathematics classroom, you should find kids using “Manipulatives.” These are physical objects—like Base 10 Blocks, Cuisenaire Rods, or ...
ENID, Okla. — Take 25 pennies. Now take out six and put them to the side. How many are left? Put three back. How many do you have now? Now put them all together and divide them into five equal piles.
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