The Math Forum

Ask Dr. Math

Elementary Archive

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

This page:
  subtraction checkmark

  Dr. Math

See also the
Dr. Math FAQ:
  order of operations

Internet Library:




   3D and higher

Golden Ratio/
Fibonacci Sequence



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

Word Problems

Browse Elementary Subtraction
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.
    Subtraction with borrowing/regrouping.

Subtracting with Mixed Units [02/10/2009]
How would you subtract 1 ton, 12 lb, 6 oz from 4 tons?

"Subtraction" and "Negative"--Same Sign, Different Concepts? [12/14/2005]
Why do we use "-" to mean both "subtraction" and "negative", when those are two different concepts?

Subtrahend and Minuend [03/10/1997]
What are subtrahend and minuend? I think they have to do with subtraction.

Take Aways [03/28/2002]
56 - 18 = ? I don't know how to do it.

Teaching Borrowing in Subtraction [03/12/1997]
What kind of suggestions do you have for manipulatives?

Teaching Children to Subtract [08/30/2005]
I am having a hard time trying to teach my 7 year old how to subtract numbers in the teens minus single digits, such as 14 - 7 or 17 - 9. I just think you have to remember them by heart. Is there an easier way?

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?

When in Rome, Know Your Place — Less a Written Notation for It [01/27/2015]
An adult wonders how Romans could have developed their rules for subtraction absent place value. Citing their use of the abacus, Doctor Peterson distinguishes between operating with the concept and representing it.

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.

Page: [<prev]  1  2  3

Search the Dr. Math Library:

Search: entire archive just Elementary Subtraction

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- The Math Forum at NCTM. All rights reserved.