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how
describes process or steps
why
gives reasons for doing that thing
List Polya's Four Steps, in order. Each step is a 3-word phrase/sentence, except the last, which is only 2 words.
Understand the problem
devise a plan
carry it out
look back
What are the deeper meanings behind Polya’s first step: Understand the Problem
context (setting)
terminology, notation
What are the deeper meanings behind Polya’s second step: Devise a plan
need a good toolbox (list of options)
no guarantees that it will work
What are the deeper meanings behind Polya’s third step: Carry it out
actual work happens
need good labels
if explaining don’t make big leaps that are hard to follow
explain source of computation
What are the deeper meanings behind Polya’s fourth step: Look Back
check computation
is answer reasonable
answer what was asked
Look for a pattern
The problem's information, predicted work, or possible answers feature some REPETITION.
Make a table or list
There are several options/lots of information to keep ORGANIZED
Examine a simpler problem
The problem's numbers are TOO BIG or the situation TOO COMPLICATED.
Identify a sub-goal
The problem has some issue or step that must be addressed BEFORE ANYTHING ELSE can be done.
Write an equation
The answer is an UNKNOWN NUMBER AND the problem gives enough information to create a RELATIONSHIP about it.
Draw a diagram or picture
The problem contains information that you need/want to VISUALIZE.
Guess and check
There are a REASONABLE number of possible options AND the problem gives a value or condition to CHECK THEM AGAINST.
Work backward
The problem gives a clear CHAIN OF EVENTS or STORY in which you know about the "end" and need to find out about the "beginning."
Use elimination
The problem or your work involves some possibilities that can be RULED OUT.
Use direct arithmetic
The problem requires STRAIGHT-FORWARD adding, subtract- ing, multiplying, or dividing numbers with NO ADDITIONAL INTERPRETATION.
Break into cases
The problem features TOTALLY SEPARATE QUANTITIES or SITUATIONS, like positive/negative, small/medium/large, having different fixed amounts of something (like 1 dime vs. 2 dimes), etc.
Geometric sequence
a sequence where we always multiplying (or dividing) each term by the same amount to create the next term
Fibonacci-type sequence
sequence where we always add two terms to get the next
Arithmetic Sequence
sequence that always adds (or subtracts) the same amount to change each term into the next
Difference sequence
new sequence that shows how each term of an original sequence changes to make next term
2+3=5 What are the highlighted numbers called in an addition sentence?
Addends
2+3=5 What is the highlighted number called in an addition sentence?
Sum
7-4=3 What is the highlighted number called in an subtraction sentence?
minuend
7-4=3 What is the highlighted number called in an subtraction sentence?
subtrahend
7-4=3 What is the highlighted number called in an subtraction sentence?
difference
7 x 8 = 56 What are the highlighted numbers called in an multiplication sentence?
factors
7 x 8 = 56 What is the highlighted number called in an multiplication sentence?
product
18/6=3 What is the highlighted number called in an division sentence?
dividend
18/6=3 What is the highlighted number called in an division sentence?
divisor
18/6=3 What is the highlighted number called in an division sentence?
quotient
Fact Family
set of related number sentences that all 1. use the name #’s and 2. show addition and subtraction or multiplication and division
(a) changing the order of addends does not change the sum
Commutative Property of Addition
(b) a+b = b+a
Commutative Property of Addition
(a) changing the order of the factors does not change the products
Commutative Property of Multiplication
(b) ab = ba
Commutative Property of Multiplication
(a) Changing the grouping of the addends does not change the sum
Associative Property of Addition
(b) (a+b) + c = a + (b+c)
Associative Property of Addition
(a) Changing the grouping of the factors does not change the product
Associative Property of Multiplication
(b) (ab)c =a(bc)
Associative Property of Multiplication
(a) Adding zero to any number leaves that number unchanged (We call the 0 the additive identity)
Identity Property of Addition
(b) a+0 = 0+a=a
Identity Property of Addition
(a) Multiplying any number by 1 leaves that number unchanged. (1 is the multiplicative identity)
Identity Property of Multiplication
(b) a x 1 = 1 x a = a
Identity Property of Multiplication
(a) mulitplying any number by 0 gives 0
Zero Property of Multiplication
(b) a x 0 = 0 x a = 0
Zero Property of Multiplication
a(b+c)= ab +ac or (b+c)a = ba+ca
Distributive property of multiplication over addition
a (b-c)= ab - ac or (b-c)a = ba-ca
Distributive Property of Multiplication over subtraction
number
idea of how many
system of writing numerals
hindu arabic
place value
means where a digit occurs in an numeral-offsets how much it is worth
numeral
how we write a number
Digit
0-9
Common Difference (in Arithmetic)
same amount to get to each next term
Common Ratio (in Geometric)
same amount to get to each next term (will look like fraction in division
sequence
an ordered list of items called terms
term
A term is an individual item that occurs within a sequence