# Shared Flashcard Set

## Details

MATH 1350-Ch 4 Vocab
Whole Number Computation - Mental, Electronic, Written
28
Mathematics
03/13/2013

Term
 Right Distributivity of Divsion over addition
Definition
 Whenever the 3 quotients are whole numbers:(a+b) / c = (a/c) + (b/c)
Term
 Compatible Numbers
Definition
 numbers whose sums, differences, products or quotients are easy to calculate mentally.ex: 86 + 14 = 100; 600/30 = 20
Term
 Compensation
Definition
 The process of reformulating a sum, difference, product or quotient to one that is more readily obtained mentally.
Term
Definition
 Ex: 98 + 59 = 157      +2     -2     100 + 57 = 157
Term
 Equal Compensation (for subtraction)
Definition
 Ex: 47 - 29 = 18      +1   +1       48 - 30 = 18
Term
 Multiplicative Compensation
Definition
 Ex: 48 *  5 = 240       /2   *2      24 * 10 = 240
Term
 Left-to-Right Methods
Definition
 Ex: 342 + 136 = 478       300 + 100 = 400         40 +  30 =   70           2 +    6 =    8
Term
 Multiplying Powers of 10
Definition
 Ex: 100 * 1000 = 100,000          104 * 105 = 109             20 * 30 = 600
Term
 Multiplying by Special Factors
Definition
 Numbers such as 5, 25, 99 Ex: 38 * 5 = 190             *2       38 * 10 = 380                         /2                       190
Term
 Computational Estimation
Definition
 process of finding an approximate (estimate) to a computation, using mental math
Term
 Range Estimation
Definition
 Using a low value and high value to find a range EX: 257 + 576 = ?       200 + 500 = 700       300 + 600 = 900 Range is from 700 - 900
Term
 Range
Definition
 low value to high value
Term
 One-Column Front-end Estimation Method
Definition
 Always provides the low estimate in addition & multiplication EX: 498 + 251 = ?       400 + 200 = 600
Term
 Two-Column Front-end Estimation Method
Definition
 Uses the low estimate of the ten's position, a closer estimation EX: 498 + 251 = ?       490 + 250 = 740
Term
Definition
 EX: 498 + 251 = ?       400 + 200 = 600         98 +   51 = 100 + 50                           750
Term
 Front-end Estimation
Definition
 3 Types - Range Estimation, One-Column/Two Column
Term
 Round Up/Round Down
Definition
 EX: 473 rounded down 470; rounded up 480
Term
 Truncate (aka Rounding Down)
Definition
 "to cut off"EX: 1276 truncated to 1200
Term
 Round a 5 up
Definition
 EX: 475 rounds to 480
Term
 Round to nearest even
Definition
 EX: 545 rounded to 540, not 550 (4 is even)
Term
 Round to Compatible Numbers
Definition
 EX: 26 * 37 -> 25 * 40 = 1000
Term
 Arithmetic Logic - calculators
Definition
 the calculator performs operations in the order they are entered
Term
 Algebraic Logic - calculators
Definition
 the calculator evaluates expressions according to the usual mathematical convection for order of operations
Term
 Parentheses - calculators
Definition
 used for order of operations in algebraic calculators
Term
 Constant Functions - calculators
Definition
 repeated operations on calculators
Term
 Exponent Keys - calculators
Definition
 Three common exponenet keys: x2 = 32 enterd as 3 "x2" xy = 73 entered as 7 "xy" 3 ^ = 73 entered as 7 "^" 3
Term
 Memory Functions - calculators
Definition
 stores numbers in calculators memory for future use
Term
 Scientific Notation - calculators
Definition
 2.3 x 101 shows as "2.3E1" in calculator
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