Upload
malcolm-arnold
View
220
Download
1
Tags:
Embed Size (px)
Citation preview
CAHSEE PREP.
Session 1Number Sense
Chapter 1
OFL Prep Sessions
Why take the CAHSEE test and prep classes?
It is required of ALL students to graduate high school.
You need to get about 70% of the questions correct to pass the test.
The prep classes will give you strategies and knowledge to help you on the test.
Test Taking Strategies
Look through the test before answering any questions.
Mark questions which look easy to go back to and work on first.
Write down all formulas and stored knowledge before answering questions.
Show all your work and circle the answers in your workbook.
Absolute Value
Everything inside the | | symbol becomes positive when the symbol is removed.
4
6 10
5
7 5 9
2
If the numbers have the same sign, add and keep the sign.
If the numbers have different signs, subtract the numbers and keep the sign of the larger number.
Adding and Subtracting Integers
4 ( 7)
( 6) ( 3)
4 ( 5)
9 2
Multiply and Divide Integers
Drama Club members are washing cars to earn money for their script fund. Each car washed adds $5 to the fund. Each script they buy subtracts $6 from the fund. How much does the fund increase if they wash 20 cars?
Multiplication and Division:
(+) x (+) = +(-) x (-) = +(+) x (-) = - or (-) x (+)
= -
6( 2)
(3)( 2)( 10)
( 48) ( 8)
Add and Subtract Fractions
Fractions must have the same denominator before adding or subtracting.Elizabeth needs ¾ of a cup of flour for a recipe. She only has ¼ of a cup. How much more flour does she need?
More Add and Subtract Fractions
1 3
12 8
13 10
20 25
1 2
4 3
Add and Subtract Mixed Numbers and Improper Fractions
First you need a common denominator.MIXED NUMBERS: Then add the
fractions, followed by the whole numbers
1Sally bought 5 pounds of apples and
83
7 pounds of bananas. How many pounds 8
of fruit did Sally buy?
Add and Subtract Mixed Numbers and Improper Fractions
3 34 2
8 4
9 5
2 3
10 7
3 5
Multiply and Divide Fractions and Mixed Numbers
Change Mixed Numbers to Fractions:
4 (3 7) 4 21 4 253
7 7 7 7
2 11 2
5 4
Multiply and Divide Fractions and Mixed Numbers
5 2
6 3
4 2
5 3
2 14 2
3 4
Decimals
Juanita bought a sweatshirt for $12.50
and a pair of jeans for $26.95. How much
did she pay for the jeans and sweatshirt together?
Decimals
Ashton bought 5 pounds of bananas
for $0.92 a pound. How much did he
have to pay for the 5 pounds of bananas?
Decimals
92.1 16.35 5.21 0.002 0.57 3
Exponents
Zero Exponents
Negative Exponents
Product Powers
Quotient Powers
naexponent
base
0 1a 4
4
1a
a
m n m na a a
mm n
n
aa
a
Exponents
3
A teaching hospital estimates that their staff
members treat 8 patients per week. How
many patients are treated per week?
Exponents
0Simplify. 2
2Simplify. 5
3Simplify. (-2)
5 3Multiply. 3 3
10 4Divide 7 73 5Divide. 4 4
Scientific Notation
Scientific Notation allows you to express very large or very small numbers without having to use numerous zeros.
In 2003, about 2,900,000 people attended conferences for engineers. What is this number written in scientific notation?
Scientific Notation
5What is 6.175x10 written in standard form?
3Write 2.5 x 10 in standard form?
3
3 5
Compare and order 2.5 x 10 ,
6.9 x 10 , 3.64 x 10 from least to greatest.
Convert Fractions, Decimals, and Percents
1
0.25 25%41 1
0.3 33 %3 3
10.5 50%
22 2
0.6 66 %3 3
3
4
Convert Fractions, Decimals, and Percents
4
Write as a decimal and a percent.5
Write 0.23 as a fraction and as a percent.
Convert Fractions, Decimals, and Percents
Write 38% as a decimal and as a fraction.
The paint-by-number directions said to paint 60% of the circle red. What fraction of the circle should NOT be painted?
Convert Fractions, Decimals, and Percents
7Write the fraction as a decimal.
11
3Change to a percent.
20
Percentage Change
amount of changePercent of change = 100%
original number
A box of cards originally sold for $4. Now it sells for $6. What is the percent increase?
Percentage Change
Malory’s cat weighed 24 pounds before it was put on a diet. After 5 weeks it weighed 19 pounds. What is the approximate percent of decrease?
Percentages
At Joe’s Electronics Store, a CD player regularly costs $79.70. It is on sale for 30% off. What is the sale price?
Percentages
The owner of Carmen’s Bike Shop buys bicycle tires for $6.00 each and sells them to her customers with a 20% markup. What is the retail cost of the bicycle tire?
Percentages
A $125 ski jacket is on sale for $93.75. What is the percent of the discount?
Percentages
Lydia sold $369.00 in clothing. She gets a 5% commission on the clothes she sells. What is her commission on the clothing sales?
Roots
The square roots of n are all the numbers of m so that m2 = n.
Simplify. 144 Simplify. - 16
The square root of 30 is between which
two positive consecutive integers?
HOMEWORK
See Assignment Sheet – Session 1
Homework is due at the next class meeting or by the assigned date!