Ordering and absolute value
Right is greater; |a| is the distance to 0.
Watch out: −8 is less than −3.
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The coordinate plane
x right/left, y up/down; same coordinate: subtract or add across 0.
Watch out: x comes first.
Common factors and multiples
GCF: largest common divisor. LCM: smallest common multiple.
Watch out: do not swap them.
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