Estimation
What is the best estimation for 2 x 32?
60
If Ms. Santos has 5 boxes of crayons and 24 crayons in each box, how many crayons does she have?
120
Is 5 a prime or composite number?
Prime!
32 x 6
192
What are all the factor pairs of 11?
1, 11
The school collected 1,876 cans for a food drive. Which is the best estimate of the number of cans collected?
1,900
or
2,000
Harry had 500 pennies in a jar. He sorted the pennies into 25 different stacks. Each stack had the same number of pennies. How many pennies were in each stack?
20
Is 45 a prime or composite number?
Composite!
12 x 8
96
What are all the factor pairs of 10?
1, 10
2, 5
Tim is buying 3 notebooks that cost $4.95 each. About how much will he spend in total?
$15
552
Which number is a prime number: 63 or 11?
11
709 x 8
5,672
What are all the factor pairs for the number 21?
1, 21
3, 7
What is the best estimate for 20 x 43?
800?
You have 58 photos. If 4 photos fit on one page of an album, how many pages do you need to put all the photos in the album?
15
Is 2 a prime or a composite number?
Prime!
48 x 12
What are all the factor pairs of 24?
1, 24,
2, 12
6, 4
3, 8
What is the best estimate for 18 x 96?
1,800
or
2,000
The fifth grade field trip has 112 students going on a field trip. There will also be 4 teachers and 10 chaperones going on the trip. If each bus can seat 30 people, how many buses will the fifth grade need to take all of the students and adults on the trip?
5
Write down a composite number!
Answers will vary :)
89 x 47
4,183
What factor pair is missing for 25:
1, 25
?
5 x 5