3rd grade math unit 2

20 terms by rrtuch 

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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.

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