# directed number

## directed number

[də′rek·təd ′nəm·bər]
(mathematics)
A number together with a sign.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
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Eagle 2 also directed number three and four to take spacing, ensuring safe separation from number one as he recovered his aircraft from an unusual attitude.
The concepts required to understand directed number traditionally have proven very difficult for many students, and equally difficult for teachers to find a way to present the materials.
Teachers regularly revisit the plethora of different aids to teaching directed numbers and operations, with everyone convinced that their method is the best approach!
The only real decision is between using central reservations or having a directed number for association meetings and smaller conventions.
"Four hundred lbs." In an effort to save gas, the flight lead directed number two to shut down an engine, which is not an accepted procedure.
These challenges had a focus on using Directed Number in context, a topic which students had studied in the previous weeks.
Instead of spending a large block of time on the project, students were introduced to it about four weeks into the term, after completing the directed number topic, and given a week to make a start.
Conversations ranged from making sure connecting flights were not departing before the passenger arrived, ways of dealing with different currencies (some students found currency converters online, others converted between Euros and dollars using a conversion rate), using directed numbers in context, how to calculate means, percentages and areas.
This article seeks to address a common problem that many Mathematics students have with directed numbers. Directed numbers are either positive or negative.
The students were learning about Directed Numbers, something they often struggle with and a topic where I find it hard to explain using real life situations when using addition and subtraction.
I began the lesson by asking students to say anything they remembered about directed numbers. Students volunteered information such as "moving to the right is positive and to the left is negative; the opposite of positive 1 is negative 1; temperatures can be above or below zero; East is positive and West is negative; and depositing money in the bank is positive while withdrawing is negative." A pretty good start!
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