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Math In Focus: Chapter 2: Estimation and Number Theory Flashcards | StudBud
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Math In Focus: Chapter 2: Estimation and Number Theory
Math In Focus: Chapter 2: Estimation and Number Theory
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Answers
1
Which number is a composite number?
33
59
1
5
2
Is 20 a multple of 5?
Maybe
No
<p>Yes</p>
3
Name a common factor of 3 and 9.
3
2
9
6
4
What is the eighth multiple of 9?
<p>56</p>
72
8
64
5
The answer in multiplication is called
the answer
sum
quotient
product
6
What are the first 4 multiples of 6?
10,20,30,40
6,12,18,24
1,2,3,4
30,36,42,48
7
You can ________to check that an answer is reasonable.
estimate
multiple
add
round
8
True or False 18 is a prime number
True
False
9
Is 63 a mutliple of 9?
No
maybe
Not sure
<p>Yes</p>
10
When using rounding to estimate 345+213 you get...
300+200
345+213
400+200
11
What is the answer when using front-end estimation 567+986=
600+1,000=1,600
500+900=1,400
500+1,000=1,500
900+600=1,500
12
An example of a composite number is 25
True
False
13
<p>When using the first digit of a number to estimate its called</p>
rounding
front-end estimation
guessing
14
Name 3 factors of 12.
12,8,14
1,10,12
2,3,4
7,15,24
15
Is 2 a factor of 27?
Yes
No
16
The first six multiples of 3 are 3, 6, 9, 12, 15, and _______
30
18
27
21
17
What is 1,340 rounded to the nearest thousand?
1,000
2,100
1,300
2,000
18
The ________ of two or more numbers is less than all other common multiples.
Least Common Multiple
Greatest Common Factor
Factor
Prime Number
19
A common factor is ONE number that other numbers share.
I don't know
True
maybe
False
20
The factors of 24 are 1, 2, 3, 4, 6, 8, _____, and 24
36
12
10
15
