How can we help?

You can also find more resources in our Help Center.

20 terms

3rd grade math unit 2

STUDY
PLAY
Turn-around-facts
Numbers can be added or multiplied in either order
Number family
same as fact family
fact family
1. a set of related addition and subtraction facts 2. a set of related multiplication and division facts
Fact extensions
Calculations with larger numbers using knowledge of basic arithmetic facts. Fact extensions apply to all four basic arithmetic operations.
Function machine
An imaginary machine used in EVERYDAY MATHEMATICS to change numbers according to a given rule.
Input
1. A number inserted into an imaginary function machine, which applies a rule to pair the input with an output. 2. Numbers or other information entered into a calculator or computer.
Output
1. A number paired to an input by an imaginary function machine applying a rule. 2. Numbers or other information displayed by calculator or computer.
Number model
A group of numbers and symbols that shows how a number story can be solved.
Parts-and-total number story
A number story in which two parts are combined to find a total. A parts-and-total diagram can be used to keep track of the numbers and missing information in such problems.
Change diagram
A diagram used in EVERYDAY MATHEMATICS to model situations in which quantities are either increased or decreased by addition or subtraction.
Change number story
A number story in which an amount is increased ( a change-to-more-story) A change diagram can be used to keep track of the numbers and missing information in such problems
Deposit
When money is placed into
Withdrawl
When money is taken out
Comparison number story
A number story in which two quantities are compared.
Partial-sums method
One method for solving addition problems
Ballpark estimate
A rough estimate to help you solve a problem or check an answer
Counting up method
When you add a number or numbers to an existing number to make it easier to work with
Addend
Any one of a (set) of numbers that are added.
Algorithm
A set of step-by-step instructions for doing something, such as carrying out a computation or solving a problem. The most common algorithms are those for basic arithmetic computation.
Parts-and-total number story
A number story in which two parts are combined to find a total. A "parts-and total" diagram can be used to keep track of the numbers and missing information.