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