Drexel dragonThe Math ForumDonate to the Math Forum

Ask Dr. Math

Elementary Archive

_____________________________________________
Dr. Math Home || Elementary || Middle School || High School || College || Dr. Math FAQ
_____________________________________________

TOPICS
space
This page:
  addition checkmark

  Search
  Dr. Math

See also the
Dr. Math FAQ:
  order of operations

Internet Library:
  addition



ELEMENTARY

Arithmetic
   addition
   subtraction
   multiplication
   division
   fractions/decimals

Definitions

Geometry
   2-dimensional
     circles
     triangles/polygons
   3D and higher
     polyhedra

Golden Ratio/
Fibonacci Sequence

History/Biography

Measurement
   calendars/
     dates/time
   temperature
   terms/units

Number Sense/
About Numbers
   infinity
   large numbers
   place value
   prime numbers
   square roots

Projects
Puzzles
Word Problems

Browse Elementary Addition
Stars indicate particularly interesting answers or good places to begin browsing.

Selected answers to common questions:
    Flashcards/worksheets on the Web.
    Order of operations.
    Number sentences.
    What is 1+1?



Number Properties [01/26/1998]
What are the definitions for addition and multiplication of: closure, commutative, associative, and identity?

Number Puzzle with Digits 1-9 in a 3 by 3 Grid [10/09/2006]
In a 3 cell by 3 cell grid, use the digits 1 through 9 to fill in the cells so each horizontal, vertical, and diagonal row of three has a sum of 15. I've tried many possibilities with no luck!

One Plus One [04/11/1997]
Are you sure that 1 plus 1 equals 2?

Ordering the Operations [11/10/1998]
Why does the order of operations have to be in that order? Who set that specific order of operations?

Order of Operations [01/25/1998]
Evaluate the expression: 30 - 5^2 + 4^3.

Order of Operations and Fractions [02/22/2002]
Given a+3 and b+5, is 105 / ab 7 or 175?

Order of Operations: Parentheses as Packages [10/25/2001]
I need help figuring out the steps in this expression: 5-{-4[2^4-11(-9- 1)]}=

Order of Operations vs. Associative Property [10/10/2002]
Is the associative property an exception to the order of operations, a corollary, or something totally unrelated?

Order of Operations vs. Distributive Property [02/04/2005]
Does the distributive property contradict the rules of order of operations? When we have a(b + c) order of operations says we should add first in the parentheses, then multiply, but the distributive property says we can multiply first to get ab + ac, then add.

Parts of a Subtraction Problem [04/09/2001]
What are the numbers 4 and 1 called in the subtraction 4 - 1 = 3?

Price of Pencils [10/07/2002]
Each year for the last 7 years the price of pencils has increased, and the new price is the sum of the prices for the two previous years. Last year a pencil cost 60 cents. How much does a pencil cost today? How much did a pencil cost 7 years ago?

Proof that 1 + 1 = 1? [09/04/1997]
Can you shed any light on this subject?

Properties [10/15/1997]
My daughter's homework asks: Which property is being shown? Commutative, Associative, Identity...

Properties, Defined and Illustrated [10/10/2001]
I need a page of information on the commutative, associative, and F.O.I.L. properties.

Sum of Products [11/01/1999]
When a word problem refers to the sum of the products, what exactly does it mean?

Teaching the Concept/Meaning of Sum [10/23/2001]
To me "the answer to an addition problem or equation" is not a true or necessarily useful definition. I define the sum as the whole or total...

Teaching your Baby Math [7/6/1996]
I saw a TV program about a baby college that taught babies how to read dots which they would add or subtract.

Using Addition and Subtraction to Check Answers [02/25/2003]
How can you use addition to check subtraction? How can you use subtraction to check addition?

Using Properties to Make Addition Easier [10/15/2003]
My daughter is being asked to use the commutative, associative, and identity properties of addition to help her add mentally. We're not sure what she's supposed to do.

Using the Distributive Property [08/23/2001]
My math teacher told us to work problems like this: a(b-c)= ab-ac.

Value of 7 [04/29/2002]
How do you find the value of 7?

Ways to Add and Divide More Easily [11/17/2008]
I have to add 2398 and 5752 and then divide by 37. I can do it, but it takes a long time. Is there any faster way to do those calculations?

What is 1 plus 1? [7/2/1996]
What is 1 plus 1?

Why Casting Out Nines Works [10/13/2008]
Can you explain in simple terms why the Casting Out Nines method works?

Why Is Mental Math Important? [03/25/2004]
How can I convince a 14 year old girl who is in 8th grade the importance of mental math? I think that skills like mentally adding and subtracting 2 digit numbers and being able to estimate multiplying 2 digit large numbers are critical. My daughter's teacher says that such skills aren't needed because of calculators and computers.

Why Rules? [08/15/2001]
Why do we need to have rules for order of operations?

Why Two Odds Always Sum to an Even [03/21/2002]
Why do two odd numbers always equal an even number but two even numbers never equal an odd number?

Working in Base 7 [08/02/2007]
How do I add, subtract, multiply and divide in base 7?

Working Up to Counting Up [09/25/2003]
My daughter wants to learn how to make change by counting up.

Years B.C. + A.D. [10/01/1997]
What's the difference in the ages of two people if one was born in 27 B.C.and the other was born in 16 A.D.?

Page: [<prev]  1  2  3

Search the Dr. Math Library:

Search: entire archive just Elementary Addition

Find items containing (put spaces between keywords):
 
Click only once for faster results:

[ Choose "whole words" when searching for a word like age.]

all keywords, in any order at least one, that exact phrase
parts of words whole words


[Privacy Policy] [Terms of Use]

_____________________________________
Home || The Math Library || Quick Reference || Search || Help 
_____________________________________

© 1994-2014 Drexel University. All rights reserved.
http://mathforum.org/
The Math Forum is a research and educational enterprise of the Drexel University School of Education.The Math Forum is a research and educational enterprise of the Drexel University School of Education.