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Math LabNumber Theory
Chapter 4
Question 1
Roger has 126 pieces of candy. He has 3 friends. Can he divide the candy evenly between his friends?
Question 2
Bert has 40 pencils. He divides him in to 2 piles. Are there any leftover pencils?
What about 3 piles?What about 5 piles?What about 6 piles?What about 10 piles?
Divisibility Rules
2: Ends in 0,2,4,6,8
3: Add digits divisible by 3
5: Ends in 0,5
6: Yes for both 2 and 3
9: Add digits divisible by 9
10: Ends in 0
Question 3
Create a factor tree for 40:
Question 4
Write 30 as 3 prime numbers multiplied together:
30 = _____ x _____ x _____
Question 5
Find the LCM of 15 and 20:
LCM: The smallest number that two numbers have as a common multiple.
6: 6 , 12 , 18 , 24
4: 4 , 8 , 12 , 16 , 20 , 24
Question 6
Find the GCF of 15 and 20.
GCF: The largest number that will divide both numbers in a pair.
15: 1 , 3 , 5 , 15
20: 1 , 2 , 4 , 5 , 10, 20
Question 7
Three miles is 16,000 ft. Re-write this in scientific notation.
______ x 10___
Question 8
Re-write 4.5 x 106 as a normal number:
Question 9
Find the next three numbers in this sequence:
4 , 8 , 12 , 16 , 20 , ___ , ___ , ___
What is the rule?
Question 10
Find the next three numbers in this sequence:
1 , 2 , 4 , 8 , 16, ___ , ___ , ___
What is the rule?
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