5 × 0 = ?, 5 × 1 = ?, 5 × 2 = ?, ..., 5 × 10 = ?
Then list all factors of the largest product
Identify if the largest product is prime or composite
Product: The answer when two or more numbers are multiplied together
Factor: Numbers that multiply together to make another number
Prime Number: A number with exactly two factors: 1 and itself
Composite Number: A number with more than two factors
Zero Property: Any number multiplied by 0 equals 0
Identity Property: Any number multiplied by 1 equals itself
- Recall the multiplication fact from memory
- Verify using repeated addition if needed
- Find all factor pairs systematically
- Determine if the number is prime or composite
- Verify results using division
5 × 0 = 0 (zero property)
5 × 1 = 5 (identity property)
5 × 2 = 10
5 × 3 = 15
5 × 4 = 20
5 × 5 = 25
5 × 6 = 30
5 × 7 = 35
5 × 8 = 40
5 × 9 = 45
5 × 10 = 50
The largest product is 50 (from 5 × 10)
Check divisibility systematically up to √50 ≈ 7.1:
50 ÷ 1 = 50 → (1, 50)
50 ÷ 2 = 25 → (2, 25)
50 ÷ 5 = 10 → (5, 10)
Factors: 1, 2, 5, 10, 25, 50
Since 50 has more than two factors (1, 2, 5, 10, 25, 50), it is composite
1×50=50, 2×25=50, 5×10=50 ✓
Factors of 50: 1, 2, 5, 10, 25, 50
50 is composite
5 × 0 = 0, 5 × 1 = 5, 5 × 2 = 10, 5 × 3 = 15, 5 × 4 = 20, 5 × 5 = 25, 5 × 6 = 30, 5 × 7 = 35, 5 × 8 = 40, 5 × 9 = 45, 5 × 10 = 50. Factors of 50: 1, 2, 5, 10, 25, 50. Since it has more than two factors, 50 is composite.
• Zero Property: a × 0 = 0
• Identity Property: a × 1 = a
• Multiplication Facts: Know basic tables up to 12×12
• Factor Finding: Check divisibility up to square root
• Prime vs Composite: Prime has exactly 2 factors, composite has more than 2
Identify the pattern in the ones place
Circle all multiples of 3 that are also multiples of 6
Circle all multiples of 3 that are also multiples of 9
Multiple: The result of multiplying a number by an integer (1, 2, 3, 4...)
Pattern Recognition: Identifying consistent relationships in sequences
Even Numbers: Numbers divisible by 2 (end in 0, 2, 4, 6, 8)
3×1=3, 3×2=6, 3×3=9, 3×4=12, 3×5=15, 3×6=18, 3×7=21, 3×8=24, 3×9=27, 3×10=30
So: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30
Looking at ones digits: 3, 6, 9, 2, 5, 8, 1, 4, 7, 0
Pattern: increases by 3, wrapping around after 9
Since 6 is a multiple of 3, every other multiple of 3 is a multiple of 6
6, 12, 18, 24, 30
Since 9 is a multiple of 3, every third multiple of 3 is a multiple of 9
9, 18, 27
If A is a multiple of B, then all multiples of A are also multiples of B
Since 6 is a multiple of 3, all multiples of 6 are multiples of 3
Since 9 is a multiple of 3, all multiples of 9 are multiples of 3
Ones pattern: 3,6,9,2,5,8,1,4,7,0
Multiples of 6: 6, 12, 18, 24, 30
Multiples of 9: 9, 18, 27
First 10 multiples of 3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30. Ones pattern: 3,6,9,2,5,8,1,4,7,0. Multiples of 6: 6, 12, 18, 24, 30. Multiples of 9: 9, 18, 27.
• Multiples Generation: Multiply by 1, 2, 3, 4...
• Pattern Recognition: Look for repeating sequences in digits
• Multiple Relationships: If A is multiple of B, then all multiples of A are multiples of B
• Verification: Division confirms multiple relationships
Calculate both sides and verify they are equal
Create a factor tree for the product
Use the tree to find all factors of the product
Commutative Property: Order of multiplication doesn't change the product
Factor Tree: Diagram showing how a number breaks down into its prime factors
Prime Factorization: Expressing a number as a product of prime numbers
4 × 9 = 9 × 4
So the blank is filled with 9
Left side: 4 × 9 = 36
Right side: 9 × 4 = 36
Yes, they are equal!
Start with 36
36 = 4 × 9
4 = 2 × 2
9 = 3 × 3
So 36 = 2 × 2 × 3 × 3 = 2² × 3²
Take all possible combinations of the prime factors:
2⁰×3⁰=1, 2¹×3⁰=2, 2²×3⁰=4, 2⁰×3¹=3, 2¹×3¹=6, 2²×3¹=12, 2⁰×3²=9, 2¹×3²=18, 2²×3²=36
1, 2, 3, 4, 6, 9, 12, 18, 36
Both 4×9 and 9×4 result in the same prime factorization: 2² × 3²
Commutative property: a×b = b×a
Prime factorization: 2² × 3²
All factors: 1, 2, 3, 4, 6, 9, 12, 18, 36
4 × 9 = 9 × 4 = 36. They are equal due to the commutative property of multiplication. Prime factorization of 36 is 2² × 3². All factors: 1, 2, 3, 4, 6, 9, 12, 18, 36.
• Commutative Property: a×b = b×a (order doesn't matter)
• Factor Trees: Break down to prime factors systematically
• Prime Factorization: Express as product of primes raised to powers
• Verification: Multiply factors back to confirm original number
Factor: Numbers that multiply together to make a product
Multiple: Product of a number and any integer
Prime Number: Number with only 1 and itself as factors
Composite Number: Number with more than two factors
Prime Factorization: Expressing a number as a product of prime numbers
Common Multiple: A number that is a multiple of two or more numbers
- Memorization: Know multiplication tables up to 12×12
- Patterns: Recognize number patterns (e.g., multiples of 5 end in 0 or 5)
- Breaking Down: Use known facts to solve unknown ones
- Repeated Addition: Understand multiplication as repeated addition
- Properties: Use commutative, associative, identity properties
- Factor Trees: Break down composite numbers systematically
• Know tables: 0× to 10×
• Zero property: a × 0 = 0
• Identity property: a × 1 = a
• Multiples of 10: end in 0
• Multiples of 5: end in 0 or 5
• Multiples of 2: even numbers
• Prime numbers: 2, 3, 5, 7, 11, 13, 17, 19, 23...
• Properties: commutative, distributive, identity, zero
4×1=4, 4×2=8, 4×3=12, 4×4=16, 4×5=20, 4×6=24
Analysis: The chart shows the multiplication pattern for 4 and its multiples.
- Pattern: each result increases by 4
- Ones digits follow pattern: 4,8,2,6,0 (repeating)
- All multiples of 4 are even (multiples of 2)
- All multiples of 4 are also multiples of 2
Then identify the least common multiple (LCM) of 2 and 5
Show your work using lists of multiples
Common Multiple: A number that is a multiple of two or more numbers
Least Common Multiple (LCM): The smallest positive number that is a multiple of both numbers
Systematic Approach: Methodically listing multiples to find overlaps
2×1=2, 2×2=4, 2×3=6, 2×4=8, 2×5=10, 2×6=12, 2×7=14, 2×8=16, 2×9=18, 2×10=20, 2×11=22, 2×12=24, 2×13=26, 2×14=28, 2×15=30...
So: 2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, 40...
5×1=5, 5×2=10, 5×3=15, 5×4=20, 5×5=25, 5×6=30, 5×7=35, 5×8=40, 5×9=45, 5×10=50, 5×11=55, 5×12=60, 5×13=65, 5×14=70, 5×15=75...
So: 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90, 95, 100...
Look for numbers that appear in both lists:
10 (appears in both), 20 (appears in both), 30 (appears in both), 40 (appears in both), 50 (appears in both)
The smallest common multiple is 10
So LCM(2, 5) = 10
2 = 2, 5 = 5
LCM = highest power of each prime: 2 × 5 = 10 ✓
LCM(2, 5) = 10
The first 5 common multiples of 2 and 5 are 10, 20, 30, 40, and 50. The LCM is 10.
• Common Multiples: Found by listing multiples and identifying overlaps
• LCM: The smallest positive common multiple
• Verification: Both original numbers should divide the common multiple evenly
• Alternative Method: Use prime factorization for complex numbers
Then use it to find all factors of 60
Finally, determine if 60 is divisible by 4 and 6 using prime factorization
Factor Tree: A diagram showing how a number breaks down into its prime factors
Prime Factorization: Expressing a number as a product of prime numbers
Divisibility Rule: A number is divisible by another if its prime factorization contains all prime factors of the divisor
Find any two factors of 60: 60 = 6 × 10
6 = 2 × 3 (both 2 and 3 are prime)
10 = 2 × 5 (both 2 and 5 are prime)
60 = 2 × 2 × 3 × 5 = 2² × 3 × 5
Take all possible combinations of the prime factors:
2⁰×3⁰×5⁰=1, 2¹×3⁰×5⁰=2, 2²×3⁰×5⁰=4, 2⁰×3¹×5⁰=3, 2¹×3¹×5⁰=6, 2²×3¹×5⁰=12, 2⁰×3⁰×5¹=5, 2¹×3⁰×5¹=10, 2²×3⁰×5¹=20, 2⁰×3¹×5¹=15, 2¹×3¹×5¹=30, 2²×3¹×5¹=60
1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
For 4: 4 = 2². Since 60 = 2² × 3 × 5 contains at least 2², 60 is divisible by 4.
For 6: 6 = 2 × 3. Since 60 = 2² × 3 × 5 contains at least 2¹ and 3¹, 60 is divisible by 6.
60 ÷ 4 = 15 ✓, 60 ÷ 6 = 10 ✓
All factors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60
60 is divisible by both 4 and 6
Prime factorization: 60 = 2² × 3 × 5. All factors: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60. Yes, 60 is divisible by both 4 and 6.
• Factor Trees: Break down composite numbers until only primes remain
• Prime Factorization: Express as product of primes raised to powers
• Divisibility Rule: A number is divisible by another if its prime factorization contains all prime factors of the divisor
• Factor Counting: Use prime factorization to find all factors systematically
Factor: Numbers that multiply together to make a product
Multiple: The result of multiplying a number by an integer
Prime Number: A number with exactly two factors: 1 and itself
Composite Number: A number with more than two factors
Least Common Multiple (LCM): Smallest number that is a multiple of both numbers
Greatest Common Factor (GCF): Largest number that divides both numbers evenly
- Read the problem: Understand what is being asked
- Plan your approach: Decide which method to use
- Understand the concept: Multiplication as repeated addition
- Memorize tables: Know multiplication facts up to 12×12
- Find factors: Systematically check divisibility up to square root
- Generate multiples: Multiply by 1, 2, 3, 4...
- Recognize patterns: Identify number relationships
- Apply properties: Use commutative, associative, identity properties
- Use factor trees: For prime factorization
- Verify results: Use division to confirm
- Check your work: Review for accuracy
• Multiplication tables: 0× to 10×
• Zero property: a × 0 = 0
• Identity property: a × 1 = a
• Prime numbers up to 30: 2, 3, 5, 7, 11, 13, 17, 19, 23, 29
• Multiples of 10: always end in 0
• Multiples of 5: always end in 0 or 5
• Even numbers: multiples of 2
• Properties: a×b=b×a, (a×b)×c=a×(b×c), a×1=a, a×0=0