day 4: ~ multiply & divide integers, fractions, and decimals ~ estimation, square roots, and the...
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Day 4:~ Multiply & Divide Integers,
Fractions, and Decimals~ Estimation, Square Roots, and
the Number Line
Objectives
• I can multiply and divide integers• I can multiply and divide decimals• I can multiply and divide fractions
Warm-Up
1. 2. 3.
4. 5. 6.
7. 3.142 + 12.7 8. 16.75 – 8.318
Rules for Multiplying and Dividing Integers
(neg) (neg) = (pos)(-) (-) = (+)
And
(neg) (pos) = (neg)(-) (+) = (-)(+) (-) = (-)
Rules continued
When the signs are the SAME, answer is
____________________
When the signs are DIFFERENT, answer is
____________________
Examples
1) (-7) (-8) 2. 12 ÷ (-4)
3. Billy casually bet Sammy that the Dodgers were going to beat the Angels in the next game. Billy already owed Sammy $5 (_____), if Billy bet, “double or nothing” with Sammy, how much could Billy potentially loos to Sammy if the Dodgers loose?
Try
4. 6 (-4)
5. (-42) ÷ (-6)
6. (-36) ÷ 4
Multiply Fractions
The word _______ also means multiply.
7) So, what is half of 6?
8) What is a quarter of 8?
How do you multiply fractions when they aren’t this easy? What are the rules/steps?
Multiplying Fractions Steps:9.
10.
11. What happens if a fraction is negative?
Try
12. 13.
14. You babysit for hours each week. How many hours do you babysit in a month?
Dividing Fractions
Multiply by the ____________________
Step 1: Keep 1st termStep 2: Change to multiplicationStep 3: Flip the 2nd termStep 4: Multiply fractions as usual
Examples
15)
16) How many t-shirts can be made with 16 yds of fabric if each t-shirt rquires yds?
Try
17)
18) How many 9 inch ribbons can be cut from yds of ribbon? (**Remember … 12 in = 1 ft and 1 yd = 3 ft)
Multiplying Decimals
Multiply as if they were whole numbers (DO NOT NEED TO LINE UP DECIMALS). Count how many numbers are after decimals and move that many places in the final answer Same rules apply for positives and negatives
Example
19) 13.2 × (-0.24)
Try
20) 5.8 × (-4.2)
Dividing Decimals
Copy problem down as you would for whole numbers
You cannot divide by a decimal number, so move the decimal point in the divisor until it becomes a whole number
Move the decimal point in the dividend that same amount of places. Using zeros when necessary
Copy the decimal point form the dividend straight above in the place for the answer
Same rules apply for positives and negatives
Example
21) (-374.5) ÷ 0.07
Try
22) 18.46 ÷ 1.3
Try
23) $1125.25 ÷ 0.75
Objectives and Standard
• I can correctly order fractions, decimals, and irrational numbers from least to greatest.
• I can compare fractions and decimals• I can estimate radicals to their largest whole
numbers
14.6 NF Understand decimal notation for fractions, and compare decimals and fractions
Quick Review
Convert:1. to a decimal.
2. 0.35 to a fraction
3. to a decimal and then estimate
Comparing Fractions and Decimals
Write the Correct Comparison Symbol ( >, <, or = ).
1. ___ 0.483 2. ___ 0.827
Estimating Square Roots
Estimate .
Estimate .
Ordering Numbers
Example:Put in order from least to greatest., , ,
Ordering Numbers
Try:Put in order from least to greatest., , ,
Homework
Day 4 WorksheetStudy for Unit 1 Test – Review all notes!!
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