Factors
List the Factors of 20
1,2,4,5,10,20
What is a prime number?
A number with only two factors (1 and itself).
What are the first 6 multiples of 5?
5, 10, 15, 20, 25, 30
649 + 385 = ?
Find the real sum AND the estimated sum.
1,034 and 1,000
Is 18 a factor of 36?
Yes.
What is a composite number?
A number with more than two factors.
What is the fifth multiple of 8?
40
538-269= ?
Find the real difference AND the estimated difference.
269, 200
What is the GCF of 36 and 60?
12
Is 21 a prime or composite number?
Composite
What is the LCM of 6 and 8?
24
282 x 3= ?
Find the real product AND the estimated product.
846, 900
5, 12, 18, 30, 35, 42, 53, 81, 102
List the numbers from above that have 3 as a factor.
12, 18, 30, 42, 8, 102
9, 15, 19, 26, 33, 37, 45, 47
Which numbers are prime?
19, 37, 47
What are the first 10 multiples of 9?
9, 18, 27, 36, 45, 54, 63, 72, 81, 90
119 x 5 = ?
Find the real product AND the estimated product.
595, 500
Add up all of the even factors of 42. What is the sum?
64
Find the factors of 45.
Which factors of 45 are prime numbers?
3 and 5
54, 20, 48, 60, 72
Which of these numbers are multiples of 8?
48 and 72
Mrs. Smith has $1,000. She wants to buy a $484 couch, a $210 dog, and a $165 coat. Using estimation, does Mrs. Smith have enough money.
Give your answer with an estimate!
Yes.