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15 cards from this deck
N={1,2,3,4,5,...}N = \{1, 2, 3, 4, 5, ...\}N={1,2,3,4,5,...} - positive counting numbers
No, natural numbers do not include zero or negatives
Z={...,−3,−2,−1,0,1,2,3,...}Z = \{..., -3, -2, -1, 0, 1, 2, 3, ...\}Z={...,−3,−2,−1,0,1,2,3,...}
Zero and negative numbers
Numbers written as ab\frac{a}{b}ba where a,b∈Za, b \in Za,b∈Z and b≠0b \neq 0b=0
Terminating decimals and recurring decimals
Numbers that cannot be expressed as fractions
Non-terminating, non-repeating decimals
2\sqrt{2}2, 3\sqrt{3}3, 5\sqrt{5}5, π\piπ
All rational and irrational numbers combined
N⊂Z⊂Q⊂RN \subset Z \subset Q \subset RN⊂Z⊂Q⊂R
'Is an element of' or 'belongs to'
Any integer nnn can be written as n1\frac{n}{1}1n
No, e.g. 4=2\sqrt{4} = 24=2 and 16=4\sqrt{16} = 416=4 are rational
Irrational number (227\frac{22}{7}722 is just an approximation)
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