OBTUSE

1) .

OCATGON

ODD NUMBER

1) no

OPERATION

1) subtraction

OPPOSITE

1) -1

ORDER

1) 1/6, 1/4, 2/5, 5/12

2) n, t, e (the first letters of the natural numbers arranged in order starting with the smallest

ORDERED PAIR

1) 12

2) 1

3) 3

4) 3

ORDINAL NUMBER

1) 17

2) 125

3) 81

4) hundred-thousandths

ORDINATE

1)

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