4.5
The student will
a) determine common multiples and factors, including least common multiple and greatest common factor;
b) add and subtract fractions having like and unlike denominators that are limited to 2, 3, 4, 5, 6, 8, 10, and 12, and simplify the resulting fractions, using common multiples and factors;
c) add and subtract with decimals; and
d) solve single-step and multistep practical problems involving addition and subtraction with fractions and with decimals.
Essential Knowledge and Skills (Full Curriculum Framework for this SOL)
Textbook Correlation
| Grades | Lesson(s) | |
| 4.5a | 4 | Fluency Plan #2, 1-8, 9-12 |
| 4.5a | 3 | 9-6 |
| 4.5b | 4 | 9-7. 9-8, 9-9, 9-12, 9-13, 9-14 |
| 4.5c | 4 | 3-19, 11-9, 11-10, 11-11, 11-12, 11-13 |
| 4.5d | 4 | 3-19, 9-7. 9-8, 9-9, 9-12, 9-13, 9-14, 11-9, 11-10, 11-11, 11-12, 11-1 |
Links to Related SOL |
Games and On-Line Practice:
amby.com: Greatest Common Factors
Mini-lesson and on-line practice
mathisfun.com: Greatest Common Factor Tool
A tool that finds the GCF for 2 or 3 numbers
aaamath.com: Greatest Common Factor
Mini-lesson and on-line practice
mathplayground.com: How to do (almost) anything in math
Short video example of finding the GCF (need speakers/headphones)
glencoe.com: Greatest Common Factor
Manipulative site to help find the GCF (need speakers/headphones)
mathisfun.com: Least Common Multiple Tool
A tool that finds the LCM for 2 or 3 numbers
aaamath.com: Least Common Multiple
Mini-lesson and on-line practice
cs.gmu.edu: What is the Least Common Multiple?
Visual explanation of LCM
mathgoodies.com: Multiples and Least Common Multiple
Explanation in a table format, with online practice
nlvm.usu.edu: Base Block Decimals
Base-10 blocks to show addition and subtraction of decimals
cemc2.math.uwaterloo.ca: Decimal Mania
Addition and subtraction practice
coolmath.com: Decimal Cruncher
Pick the operation and level of difficulty
mye-coach.com: Decimal Blitz
5 addition and subtraction games to choose from
math-play.com: Baseball Math
Subtracting decimals game
math-play.com: Basketball Math
Subtracting decimals game
Teacher Reference:
School Health Initiative Project: Fitness Division
Students identify the divisible factor while participating in physical activities.
School Health Initiative Project: Miss-Fit Factor
Students decipher math equations by identifying the operation used and any missing factors/divisors, or products/quotiens within the equation.
math.com: Greatest Common Factor
Explanation, examples, and practice of GCF
math.com: Least Common Multiple
Explanation, examples, and practice of LCM
helpwithfractions.com: The Greatest Common Factor
Explanation of GCF, with several links included
helpwithfractions.com: Least Common Multiple
Explanation of LCM, with several links included
mathisfun.com: Greatest Common Factor
Explanation of GCF, with several links included
mathisfun.com: Least Common Multiple
Explanation of LCM, with several links included
k12math.com:Least Common Multiple
Explanation of LCM
basic-mathematics.com: Least Common Multiple
Explanation of LCM
mathteacher.com: Addition and Subtraction of Decimals
Explanation of addition and subtraction of decimals
chccl.k12.nc.us: How to add and subtract decimals
PowerPoint that explains addition and subtraction of decimals
tenmarks.com: Addition and Subtraction of Decimals
Video, quick reference, and practice questions on addition and subtraction
education.vic.gov.au: Addition and Subtraction of Decimals
Good explanation; base-10 blocks explanation included
susancanthony.com: Teaching Math with Base-10 Blocks
Descriptions of using base-10 blocks to add; whole numbers and decimals
explorelearning.com: Gizmos
Several lessons on adding decimals
authorstream.com: Decimals Addition and Subtraction
Short power point on adding and subtracting decimals
Free Worksheets:
softschools.com: Greatest Common Factor Worksheets
Generate worksheets; choose maximum and minimum numbers
mathslice.com: Greatest Common Worksheet
Generate worksheets; choose the range
worksheetworks.com: Greatest Common Factors
Generate worksheets; choose difficulty level (easy, moderate, or complex)
worksheetplace.com: Greatest Common Factor
9 pre-made worksheets
mathworksheets4kids.com: Greatest Common Factor Worksheets
16 pre-made worksheets (8 using common factors and 8 using factor trees)
math-aids.com: Greatest Common Factor Worksheets
Generate worksheets; choose the maximum number
themathworksheetsite.com: Least Common Multiple
Generate worksheets
softschools.com: Finding Least Common Multiple Worksheet
Generate worksheets; choose maximum and minimum numbers
mathslice.com: Least Common Multiplier
You choose range and number of constants
mathworksheets4kids.com: Least Common Multiple Worksheets
16 pre-made worksheets (8 using common multiples and 8 using factor trees)
homeschoolmath.net: Decimal Worksheets
Pre-made and generate-your-own worksheets
ezschool.com: Addition and Subtraction
Pre-made worksheets, vertical or horizontal, regrouping or no regrouping
mathworksheets4kids.com: Decimal Worksheets
Several pre-made worksheets
mathisfun.com: Decimal Worksheets
Several to choose from
math-drills.com: Base-10 Blocks
Worksheets with Base-10 blocks