Ones that are really long with exponents. Decimals can add difficulty if the number must be repeated vocally. The same goes for fractions. Ex) 1,794,427,931 would be tough because it is ling and has a wide variety of numbers.
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A statistical hypothesis is anything that can be tested against observations. So the hypothesis can be that you can remember two numbers.
Dodging numbers are numbers that children often miss some numbers in a series while counting. Dodging numbers should be identified and special care be taken to make them remember these numbers. It's very normal, and most children grow out of it.
Integers are closed under division I think o.o. It's either counting numbers, integers or whole numbers . I cant remember :/
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The question is not clear. Hardest, as in the most rigid, is a triangular prism (or tetrahedron). Hardest, to work the geometry of, is probably an irregular blob.