Math+Scribe+(Daily+Class+Notes)

McMahon's Class Lesson Elapsed Time

Example 1...

2:35 - 4:15 start end

min || 25+1 hour+ 15+=1 hour 40 minutes
 * 25 min || 1 hour || 15

Example 2.....

4:15 +60=75 minutes 3:75 -2:35 --> -2:35 - 1 hour 40 minutes

Subtracting Decimals Multipying Decimals by Decimals

__Steps: Steps:__ 1.Line up the decimals. 2.Bring down the decimal. 3. Right to left 4.Subtract 5.Check - take answer and add to one addend. (inverse operation)

__Examples__: 3.5-1.32

3.50 __-1.32__ 2.18

2.18 __+1.32__ 3.50

November 2,2009 customary units of length

12 inches=1foot 36 inches=3 feet=1 yard 5,280 feet=1.760 yards=1 mile

to change... larger units to smaller units multiply smaller units to larger units divide

6 feet 8 inches+1 foot 7inches=_ __STEPS: 1:underline the units 2:decide larger to smaller or smaller to larger 3:how many__ in 6 feet 8 inches+1 foot 7 inches=8 feet 3 inches

November 9,2009 2-1 Multiplacation Patterns

7 times 20**=_** __**steps:**__

step 1:underline the base problem, then multiply

step 2:count how many zeros there are and add to the product

Communitive Property:you can change the order of the factors.

Assosiative Property:you can change the groupings of any numbers.

November 11,2009

distributive property defonition-involes breaking the apart of numbers into numbers that are easier to work with

ex:4 x 28

4 times(25+3)

(4 times 25)+(4 times3) 100 + 12= 112

Worked on page71 in text 1-4

1. 3x17 3x(10+7) (3x10)+(3x7) 30 + 21 =51 Answer 51

2. 6x31 6x (30+1) (6x30) + (6x1) 180 + 6 =186 Answer 186

November13,2009

2-5 __choose a computation method


 * zero property**__:whatever number that you multiply by zero,that number will always be zero

__**one property**__:any non-zero number that you multiply by zero will always be that non-zero number

December 8, 2009

Perimeter- the distance around the outside of any polygon.

Polygon- a closed plane figure made up of line segments.

Formulas: Perimeter= the sum of the side lengths. Perimeter of a square= 4xs Perimeter of a rectangle=(2xL)+(2xW)

December 10,2009

Circumference- the distance around any circle.

Pi research 3/14th contest How many digits of pi can you memorize. Pi= 3.1415926535897932.....

For any circle, the circumference is always about 3.14 times the diameter.

__Formula for circumference__ C=Pi x d ( diameter) C=3.14xd

3-9 **Dividing Money Jauary 9,2010**

__**step 1**__ bring up decimal

Factors & divisibilty January 12 2010

Divisible-a # is divisible by a number when the quotient is a whole number 7 the remainder is zero.

__divisibility rules__

> > > > > 3-if the sum of the digits are divisible by 3 > > > > > 4-if the last two digits are divisible by 4 > > > > > 5-if the last digit is zero or 5 > > > > > 6-if the number are divusible by both 2&3 > > > > > 9-if the sum of the digits are divisible by 9 > > > > > 10-if the last digits are zero and are divisible by ten
 * 2-if the number is even.

__//**1/13/10 prime and composite #'s**//__

__**//prime//**__-a number that has 2 factors-1 and itself.

__**//composite//**__-a number that has more than 2 factors.​