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Chapter2 Estimation & Number Theory Flashcards | StudBud
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Chapter2 Estimation & Number Theory
Chapter2 Estimation & Number Theory
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chapter2#Estimation#number theory#
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Answers
1
What are the common factors of 8 & 12?
1,2,4
1,2,4,8
1,2,3,4,6,12
1,2,3,4,6,8,12
2
Whate are the factors of 7?
1,7
1,3,5,7
1,2,3,6
1,7,14,21
3
Round each number to its greatest place value then find the sum. 291 + 456= ___ + ___=___
300 + 400 = 700
200 + 500 = 700
300 + 500 = 800
200 + 400 = 600
4
Which is a composite number?
11
24
83
41
5
7 is a ______ of 21, and 21 is ______ of 7.
factor/multiple
estimate
least common multiple
product/quotient
6
When one number is multiplied by another, the result is called a ________.
estimate
product
factor
quotient
7
Subtract then check your answers with front-end estimation. 64 - 23 = ___ ____-___=___
64 - 23 = 41 65-20=45
64 - 23 = 41 60-25=35
64 - 23 = 41 65-25=40
64 - 23 = 41 60-20=40
8
The _____ of two or more numbers is less than all other common multiples.
product
composite number
least common multiple
greatest common factor
9
What are the factors of 24?
1,3,6,9
1,2,3,4,6,8,12,24
1, 5, 9, 15
1,2,5,10,20
10
What are the first ten multiples of 5?
5,10,15,20,25,30,35,4045,50
1,5,10,15,20,25,30,35,40,45
5,10,15,20,25,30,35,4045,50,55,60
15,20,25,30,35,4045,50
11
What is the greatest common factor of 8 & 12?
8
4
1
2
12
Add then check your answers with front-end estimation. 43 + 52 = ____ ____+___=___
43 + 52 = 95 45 + 50 = 95
43 + 52 = 95 40+50=90
43 + 52 = 95 45 + 55 = 100
43 + 52 = 95 50 + 50 = 100
13
A number that has only 2 different factors is a _______.
composite number
estimate
prime number
product
14
Which number is a prime number?
17
12
45
21
15
You can ______ to check that an answer is reasonable.
product
factor
prime
estimate
16
Round each number to its greatest place value then find the sum. 65 + 32= ___ + ___=___
60 + 30 = 90
65 + 35 = 100
70 + 30 = 100
60 + 35 = 95
17
Round each number to its greatest place value then find the difference. 87 - 23= ___ - ___=___
90 - 30 = 60
85 - 25= 60
85 - 20 = 65
90 - 20 = 70
18
If you see 'about' in a word problem question, should you find an exact answer or estimate?
find an exact answer
estimate
19
What are the first five multiples of 7?
1,7,14,21,28,35
14,35,70,77,84
7,21,21,28,35,42
7,14,21,28,35
20
Round each number to its greatest place value then find the difference. 567 - 345= ___ - __=__
550 - 350- 200
500 - 300 = 200
600 - 300 = 300
600-400 = 200
