+ = Addition
- = Subtraction
X = Multiplication
/ = Division
Cmp = Comparing
Cnt = Counting
Dec = Decimals
Est = Estimation
Evo = Even / Odd
Exp = Exponents
Fac = Factoring
Fra = Fractions
Geo = Geometry
Gcf = Greatest Common Factor
Grd = Coordinate Grid
Int = Integers
Lcm = Least Common Multiple
Mon = Money
Msr = Measurement
Nmb = Numbers
Opo = Operation Order
Ord = Order
Pat = Patterns
Plv = Place Value
Prm = Prime/Composite
Rnd = Rounding
Sqr = Square Root
Tim = Time
Voc = Vocabulary
Dff = Differentials
Qud = Quadratics
Itg = Integrals
Sml = Simultaneous Equations