Given
4 hundreds flats; 5 tens rods; 2 ones cubes
Find
The number of hundreds flats in each of 2 equal piles
Solution
When 4 flats are divided into two equal groups, each group will have ...
... 2 flats
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You can imagine doing this the way a card dealer might: first put 1 flat in each of 2 piles, then do the same for the remaining 2 flats. Each pile will end up with 2 flats.
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You will have a problem if you continue with the tens rods. There is an odd number of those, so one of them will have to be exchanged for 10 ones cubes.