Elementary Math

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Numeration Systems

Babylonian - triangles and greater than sign

Egyptian- tally marks

Mayan- horizontal dots and lines

Greek- letters

Roman- Letters, used to symbolize age

Hindu- numbers

Arabic-numbers

Hindu- Arabic- US form of numbering

http://www.basic-mathematics.com/numeration-system.html

Different Ways To Count

Multiplying and Dividing

8+8+8=24

8 times 3 = 24

Properties and techniques

https://www.khanacademy.org/math/arithmetic/arith-review-multiply-divide

Divisibility

b | a - b is a factor or divisor of A and A is a multiple of b

a=bq - 2|12... 2q=12.. 9=6 No

https://www.mathsisfun.com/divisibility-rules.html

Divisibility Tests

Notation

Greatest Common Divisor Least Common Multiple

18 and 30

• {1,2,3,6,9,18}
• {1,2,3,6,10,15,30}

Greatest Common Divisor is 6

8 and 12

• 8,16,24,32,40,48...
• 12,24,36,48...

Least Common Multiple is 24



https://www.youtube.com/watch?v=PKjS17xVPow

LCM= Least common # for A & B numbers

GCD= Greatest common # that divides into the number

Adding and Subtracting

Counting on- 7+4 , start at 7 and count 8,9,10,11

Set Model- Used base ten blocks, combine if possible

Number Line- distance or length , visual aid

Whole Numbers

http://www.homeofbob.com/math/numVluOp/wholeNum/addSub/concpts.html

Properties and Techiques