ADDITION OF FRACTIONS
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( K-12math.info )

From Wikipedia " ... Imagine a pocket containing two quarters, and another pocket containing three quarters; in total, there are five quarters....."

  From Wikibook reference 1 "Before we go into fractions, let's think about what addition is. Answer these questions:
*What is 1 bird + 5 birds?
*What is 3 elephants + 9 elephants?
*What is 6 birds + 2 elephants?
Hopefully you could answer the first two, but you might have had trouble with the third. Why? Because we can't add up two different things! ......"

  From Wikibook reference 2 [a method for additing fractions]

  From Wikiversity"Fractions that have the same or "Common" denominator are called "Like" fractions. 1/3, 2/3 (one-third, two-thirds)

To add Like fractions together such as these: 1/3 + 2/3 = ? (one-third plus two-thirds equals what?)
1. Add the numerators (the top numbers): 1 + 2 = 3 (one plus two equals three)
2. Use the common denominator (the bottom numbers): /3
All together it looks like this: 1/3 + 2/3 = 3/3 (one-third plus two-thirds equals three-thirds)..... "
   Retrieved 2 March 2010

ADDITION OF FRACTIONS
Series | Code | Information


Textbook Series:
Grades: K-11 (ages: 5-16)
1. Harcourt, Brace Jovanovich(1972)
2. D.C. Heath (1972)
3. Laidlaw (1978)
4. Houghton Mifflin(1981)
5. Addison-Wesley(1985)
6. Harper and Row(1985)
7. Holt, Rinehart and Winston(1985)
8. Harcourt, Brace Jovanovich(1985)
9. Houghton Mifflin(1985)
10. Scott, Foresman(1986)
11. Houghton Mifflin(2002)
12. McGraw-Hill/Glencoe K-8 (2002)

CNX Connexions OER Mathematics Grade 1-9 (2009)

Code:
USAGE CODE:
4  Definition or formal development
3 Term present
2 Synonym used
1 Enrichment
- Term not present
*- Material unavailable
Grade: _K___ _1___ _2___ _3___ _4___ _5___ _6___ _7___ _8___ _9___ _10__ _11__
Age: 5 6 7 8 9 10 11 12 13 14 15 16
  1-1972 - - - - 4-148 4-152 4-142 4-131 4-051 - - -
  2-1972 - - - - 4-138 4-216 3-131 - - - - -
  3-1978 - - - - 4-274 4-160 4-202 4-212 - - - -
  4-1981 - - - - 3-288 3-190 3-194 4-248 - - - -
  5-1985 - - - - 4-246 4-232 4-204 4-206 4-092 - - -
  6-1985 - - - - 4-286 4-214 4-226 4-219 4-118 - - -
  7-1985 - - - - 4-272 4-222 4-209 4-162 4-168 - - -
  8-1985 - - - - 4-266 4-192 4-160 4-172 4-092 - - -
  9-1985 - - - - 4-168 4-206 4-238 4-168 4-098 - - -
 10-1986 - - - - 4-316 4-272 4-246 4-168 4-118 - - -
 11-2002 - - - 3-504 4-350 4-330 4-111 4-269 - - - -
 12-2002 - - - 3-552 4-516 4-252 3-212 - - *- *- *-
 CNX
  2009		 *- - - 3 - 3 4 3 4 - *- *-

usage code - page number

(for OER materials, click on the usage code under the desired grade level.)



©1972 (paper), 1985 (APPLE II/PC), 2005(www), 2010 Jim Kelly - All Rights Reserved.