Friday, January 15, 2010

11.2 Evaluate Expressions (p.260-263)

I. Evaluate means to solve or find a value
  1. The value of the expression will change, if the value of the variable changes
  2. Follow the order of operations as usual
  3. Replace any variables with values given before evaluating
  4. Combine like terms to make the expression simpler to solve (terms are seperated by addition or subtraction symbols

Thursday, January 14, 2010

11.1 Write Expressions (p.258-259)

11.1 Write Expressions
I. Use variables to represent unknown values
II. Operation key words
Addition: sum, increase, more than, plus
Subtraction: difference, decrease, less than, minus
Multiplication: Product, factors, times, multiplied by
Division: quotient, equally shared, divided by

III. Operations are only performed when evaluating, not when writing the expression

Thursday, January 7, 2010

10.4-5 Divide Fractions and Mixed Numbers (p.234-239)

1. Change mixed numbers into improper fractions
2. Write whole numbers as fractions (8 = 8/1)
3. Turn the second fraction (the divisor) upside down (the reciprocal) then rewrite the problem as a multiplication sentence.
4. Multiply as usual.
Check out this tutorial from mathisfun.com on how to divide fractions.


Wednesday, January 6, 2010

10.3 Multiply Mixed Numbers

1. Convert any mixed number into an improper fraction.
2. Multiply the fractions (numerators, then denominators, simplify)
3. Turn the answer back into a mixed number
Check out this tutorial from mathisfun.com

Tuesday, January 5, 2010

10.2 Multiply Fractions

Three steps for multiplying fractions
1. Multiply the numerators (top)
2. Multiply the denominators (bottom)
3. Simplify

Check out this tutorial and video from mathisfun.com

Monday, January 4, 2010

10.1 Estimate Products and Quotients (p.226-227)

I. Estimate fractions by rounding to 0, 1/2 or 1 (n x 0=0, n x 1/2 = n/2, n x 1 = n)
II. For mixed numbers, round to the nearest whole number
III. For division use compatible numbers

Thursday, December 10, 2009

9.6 Draw a Diagram (p.218-219)

Steps to Solving Word Problems by drawing a diagram:
1. Think about what you know and what you are being asked to find
2. Plan a strategy - draw a diagram to show what is happening in the question
3. Solve the problem and make sure you are answering the question being asked.