reckoning
A reckoning is a calculation or number you estimate. You might say, “By my reckoning, there are now seventeen kids in the bouncy house, which might be a few too many.”
The act of counting or tallying can be called a reckoning, and so can a person’s opinion on something. You could describe an ancient astronomer’s reckoning that the Earth was at the center of the universe or your own reckoning that guests should never stay more than three days. And if you and your estranged sister have a reckoning, it means you finally get together and hold each other accountable for past actions.

problem solving that involves numbers or quantities

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extrapolation
(mathematics) calculation of the value of a function outside the range of known values

interpolation
(mathematics) calculation of the value of a function between the values already known

conversion
a change in the units or form of an expression: “conversion from Fahrenheit to Centigrade”

approximation, estimate, estimation, idea
an approximate calculation of quantity or degree or worth

derivative, derived function, differential, differential coefficient, first derivative
the result of mathematical differentiation; the instantaneous change of one quantity relative to another; df(x)/dx

integral
the result of a mathematical integration; F(x) is the integral of f(x) if dF/dx = f(x)

scalage
estimation of the amount of lumber in a log

curvature
the rate of change (at a point) of the angle between a curve and a tangent to the curve

data conversion
conversion from one way of encoding data to another way

digitisation, digitization
conversion of analog information into digital information

credit, credit rating
an estimate, based on previous dealings, of a person’s or an organization’s ability to fulfill their financial commitments

dead reckoning, guess, guessing, guesswork, shot
an estimate based on little or no information

guesstimate, guestimate
an estimate that combines reasoning with guessing

overestimate, overestimation, overrating, overreckoning
a calculation that results in an estimate that is too high

underestimate, underestimation, underrating, underreckoning
an estimation that is too low; an estimate that is less than the true or actual value

partial, partial derivative
the derivative of a function of two or more variables with respect to a single variable while the other variables are considered to be constant

indefinite integral
the set of functions F(x) + C, where C is any real number, such that F(x) is the integral of f(x)

definite integral
the integral of a function over a definite interval

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problem solving
the thought processes involved in solving a problem

the act of counting; reciting numbers in ascending order

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blood count
the act of estimating the number of red and white corpuscles in a blood sample

census, nose count, nosecount
a periodic count of the population

countdown
counting backward from an arbitrary number to indicate the time remaining before some event (such as launching a space vehicle)

miscount
an inaccurate count

poll
the counting of votes (as in an election)

recount
an additional (usually a second) count; especially of the votes in a close election

sperm count
the act of estimating the number of spermatozoa in an ejaculate

CBC, blood profile, complete blood count
counting the number of white and red blood cells and the number of platelets in 1 cubic millimeter of blood

differential blood count
counting the number of specific types of white blood cells found in 1 cubic millimeter of blood; may be included as part of a complete blood count

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investigating, investigation
the work of inquiring into something thoroughly and systematically

a personal belief or judgment that is not founded on proof or certainty

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idea
a personal view

judgement, judgment, mind
an opinion formed by judging something

eyes
opinion or judgment

parti pris, preconceived idea, preconceived notion, preconceived opinion, preconception, prepossession
an opinion formed beforehand without adequate evidence

pole
one of two divergent or mutually exclusive opinions

political sympathies, politics
the opinion you hold with respect to political questions

conclusion, decision, determination
a position or opinion or judgment reached after consideration

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belief
any cognitive content held as true

a bill for an amount due

a time or act of being held accountable; a settling of accounts