Aa

Bb

Cc

Dd

Ee

Ff

Gg

Hh

Ii

Jj

Kk

Ll

Mm

Nn

Oo

Pp

Qq

Rr

Ss

Tt

Uu

Vv

Ww

Xx

Yy

Zz

	Oo
obelus oblique oblique prism oblique triangle oblong observed frequency obtuse angle obtuse triangle octagon octahedron octal odd number odometer	ogive one one-dimensional one-to-one correspondence open curve open sentence operations operations on exponents operations on integers operations properties opposite angles opposite numbers order	order of operations order of rotational symmetry ordered pair ordinal ordinate orientation origin orthocentre ounce outcome outlier oval overestimate

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