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Grade 4, Math in Focus, Chapter 2: Estimation and Number Theory Flashcards | StudBud
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Grade 4, Math in Focus, Chapter 2: Estimation and Number Theory
Grade 4, Math in Focus, Chapter 2: Estimation and Number Theory
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1
Which is the closest estimate of 49 x 3 ?
120
12
15
150
2
A number that has 3 or more factors is a ___________________________.
composite number
ugly duckling
estimate
prime number
3
Harry had $29,000. He wants to buy a house costing $97,000.
About
how much more is needed?
$68
$7,000
$70,000
$6,800
4
Is 1 a composite number?
Yes
No
5
What is the greatest common factor of 14 and 21?
3
21
7
14
6
What is the estimated quotient of 789 ÷ 2 ?
800
400
40
790
7
Which of these statements is incorrect?
2 is a common factor of 1000 and 34.
3 is a common factor of 124 and 9.
5 is a common factor of 15 and 1,065.
6 is a common factor of 12 and 480.
8
What is the greatest common factor of 4 and 12?
1
12
4
2
9
You know a number is divisible by 3 if _____________________.
it ends in 3
it is odd
there is a 3 in it
the sum of its digits is divisible by 3
10
A number that is a multiple of two or more different numbers is called __________.
a common multiple
composite
a least common multiple
11
Is 1 a prime number?
no
yes
12
I run a lap every 4 min. Tim runs a lap every 6 min. When will we both be at the start next?
6 minute mark
12 minute mark
24 minute mark
4 minute mark
13
25 is a ____________ of 5.
multiple
factor
14
What is the sum of all of the factors of 15?
16
24
15
8
15
4 is a __________ of 16.
factor
multiple
16
What is the sum of all the factors of 10?
10
18
7
11
17
How many factors does a prime number have?
3+
1
2
18
7 is a _________________ of 42.
factor
multiple
19
In what category does the number 23 belong?
Prime
Composite
20
5 is the _______________ of 10 and 15.
least common multiple
product
multiple
greatest common factor
21
You know a number is divisible by 2 if ____________________.
it floats in the air
it looks nice
the sum of the digits is divisible by 2
it is an even number
22
In what category does the number 1,482 belong?
Composite
Prime
23
Which pair of these numbers has 12 as a common factor?
2 and 6
3 and 4
12 and 24
6 and 12
24
How many factors does a composite number have?
3+
1
2
25
What is the least common multiple of 4 and 6?
4
2
12
24
26
Find a prime number between 10 and 20.
16
15
11
14
27
Which of the following is a
multiple
of 10?
10
1
2
5
28
Which of the following is a
factor
of 10?
5
30
20
40
29
In what category does the number 7 belong?
Prime
Composite
30
Harry paid $100,000 for the house (Price: $97,000). How much change did he receive?
$3,000
$7,000
$0
$3
31
In 50 ÷ 5 = 10 , 10 is the ________________.
product
quotient
divisor
dividend
32
In 5 x 10 = 50, 50 is the ____________.
product
factor
quotient
33
Find the estimated product of 398 x 2.
400
800
2
8
34
You know a number is divisible by 6 if _____________.
it is divisible by both 2 AND 3
it is even
it is divisible by either 2 or 3
it ends in a 6
35
How many factors does the number 1 have?
3
1
2
36
What is the sum of all the factors of 9?
4
10
9
13
37
What is the sum of all the factors of 5?
6
5
1
8
38
49 is a ___________ of 7.
factor
multiple
39
What category does the number 9 belong in?
Composite
Prime
40
16 is a ______________ of 4.
multiple
factor
41
You can _________________ to check that an answer is reasonable.
estimate
prime number
rounding
product
42
What is the least common multiple of 10 and 4?
2
20
40
4
43
In what category does the number 1,341 belong?
Composite
Prime
