tuesday, april 10 th
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Tuesday, April 10 th. Warm UP. Please complete Warm up. Simplify 1. 2. Online Assessments. One side show your work One side just put answers If the computer works, then just print off your score and come with the work . When is the Math Superbowl. - PowerPoint PPT PresentationTRANSCRIPT
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Tuesday, April 10th
Please complete Warm up
Simplify
1. 2.
Warm UP1 13 24 2
27 29
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0011 0010 1010 1101 0001 0100 1011Online Assessments
• One side show your work• One side just put answers • If the computer works, then just
print off your score and come with the work
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When is the MathSuperbowl
Wednesday, April 25th
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CW Answers Fractions
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Number Sense
FactorsMultiples
CompositeDivisiblity
Prime GCFPrime Factorization
LCM
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0011 0010 1010 1101 0001 0100 1011• Whole numbers that are multiplied to
find a product are called factors of that product.
• A number is divisible by its factors.
2 3 6=
FactorsProduct
26 3÷ =6 ÷2 = 3
6 is divisible by 3 and 2.
Factors
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0011 0010 1010 1101 0001 0100 1011Practice
List all of the factors of 36
(1, 2, 3, 4, 6, 9, 12, 18, 36)
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0011 0010 1010 1101 0001 0100 1011Prime
A Prime number is a number that has exactly 2
factors-1 and itself
*2 is the only even, prime number
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Composite
• A Composite Number is a number that has more than 2 factors. *The number 1 is neither
prime nor composite
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Rules of DivisibilityDivisibility Rules
A number is divisible by. . . Divisible Not Divisible2 if the last digit is even (0, 2, 4, 6, or
8).3,978 4,975
3 if the sum of the digits is divisible by 3.
315 139
4 if the last two digits form a number divisible by 4.
8,512 7,518
5 if the last digit is 0 or 5. 14,975 10,9786 if the number is divisible by both 2
and 348 20
9 if the sum of the digits is divisible by 9.
711 93
10 if the last digit is 0. 15,990 10,536
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0011 0010 1010 1101 0001 0100 1011Tell whether 540 is
divisible by 6, 9, and 106
9
10
So 540 is divisible by 6, 9, and 10
The number is divisible by both 2 and 3.
The sum of the digits is 5 + 4 + 0 = 9. 9 is divisible by 9.
The last digit is 0.
Divisible
Divisible
Divisible
Practice
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What Did Simba Do wrong?List all the
Prime Numbers 1-13
1357
13
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Prime Factorization
Prime Factorization- writing a number as the product of its
prime factors.
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Method #1 The Tree Method
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Choose any two factors of 24 to begin. Keep finding factors until each branch ends at a prime factor.
Remember, 2 is PRIME24
2 12•
6
2
2 •
3•
246 4•
3 2 2 2
24 = 2 • 2 • 2 • 3 24 = 3 • 2 • 2 • 2
The prime factorization of 24 is 2 • 2 • 2 • 3, or 23 • 3.
• •
Write the prime factorization of 24.
Just Watch
OR
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0011 0010 1010 1101 0001 0100 1011Practice
Prime factorization of
32
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Prime Factorization Challenge
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0011 0010 1010 1101 0001 0100 1011Working Backwards
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0011 0010 1010 1101 0001 0100 1011What Did Dora Do wrong?
48
2 • 24 12 •2
6•23•2
Answer: 2• 3
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0011 0010 1010 1101 0001 0100 1011Agree or Disagree
1. The prime factorization of 24 would be 2 x 3 x 4
2. 233 is divisible by 4 because the numbers add up to 8
3. The factors of 18 include 1,2,3,6,8, and 18
4. 63 is divisible by 7 5. Ms. Evans is from Minnesota
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0011 0010 1010 1101 0001 0100 1011What is it?
Greatest Common Factor (GCF)- is the greatest
(largest) of the common factors of two or more
numbersGCF must be SMALLER or equal to the largest of the
two numbers
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There are 2 methods to finding the GCF
Method #1The Listing Method
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0011 0010 1010 1101 0001 0100 1011Practice
Find the GCF of 18 and 241.18: 1, 2, 3, 6, 9, 18 24: 1, 2, 3, 4, 6, 8, 12, 242.Common factors: 1, 2, 3,
and 63. The GREATEST common
factor is 6!
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Method #2The Slide Method
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0011 0010 1010 1101 0001 0100 1011What it Looks Like
24 and 36
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0011 0010 1010 1101 0001 0100 1011Practice
Find GCF of:
48 and 72
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What if we have more than 2 numbers?
• Use the slide method!
• Do two numbers at a time
16, 12 and 24
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0011 0010 1010 1101 0001 0100 1011Practice
24, 32 and 48
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MultiplesMultiples of a number must be equal to or LARGER than a number
•List the first 5 multiples of 3.3, 6, 9, 12, 15
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0011 0010 1010 1101 0001 0100 1011Question of the Day
What should I check first when finding the least common
multiple?
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0011 0010 1010 1101 0001 0100 1011LCM
• Least Common Multiple- is the least (smallest) of the common multiples of two or more numbers
*When finding the LCM you should always look to see if your largest
number is the LCM
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0011 0010 1010 1101 0001 0100 1011What it Looks Like
18 and 24
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0011 0010 1010 1101 0001 0100 1011Practice
Find the LCM of 18 and 24
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0011 0010 1010 1101 0001 0100 1011Word Problems
1. Think: am I finding a number larger or smaller than the ones they gave me?
2. Smaller: GCF Larger: LCM3. DRAW IT OUT4. When you find your answer
think: does this answer make sense?
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0011 0010 1010 1101 0001 0100 1011#1
Pencils come in packages of 10. Erasers come in packages
of 12. Phillip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser
per pencil. How many packages of pencils and
erasers should Phillip buy?
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0011 0010 1010 1101 0001 0100 1011#3
Boxes that are 12 inches tall are being stacked next to
boxes that are 18 inches tall. What is the shortest height at which the two stacks will be
the same height?
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0011 0010 1010 1101 0001 0100 1011Classwork-Coach Books
Page 17 (1, 4, and 8)Page 21 (1-7)
Extra Credit: p. 38 (6 & 7)
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ANY QUESTIONS?!?!?!?!