Number Sets
The set of counting numbers is referred to as what?
Natural numbers
The symbol for integers is what?
Z
Which number is the only even prime number?
2
Numbers that include negatives, zero, and positives without fractions or decimals are called what?
Integers
What is the next term in the sequence: 3, 6, 9, 12, …?
15 (Arithmetic, d = +3)
The numbers {0, 1, 2, 3, 4, …} belong to which set?
Whole Numbers
The symbol for irrational numbers is what?
Q′
Which of these numbers is composite: 13, 17, 21, 23?
21
Numbers greater than 1 with more than two factors are called what?
Composite numbers
What is the next term in the sequence: 2, 4, 8, 16, …?
32 (Geometric, r = ×2)
The number –45 belongs to which sets of numbers?
Integers, Rational
What symbol is used for the set of all numbers, rational and irrational?
R
Which number is prime: 29, 35, 39, 49?
29
A sequence where each term is obtained by adding or subtracting a fixed number is called what?
Arithmetic sequence
Find the next two terms: 50, 45, 40, 35, …
30, 25 (Arithmetic, d = –5)
The set of non-terminating, non-repeating decimals is called what?
Irrational numbers
The symbol for whole numbers is usually what?
W
Which set contains only composite numbers: {12, 15, 18}, {3, 5, 9}, {7, 11, 13}?
{12, 15, 18}
A sequence where each term is obtained by multiplying or dividing by a fixed number is called what?
Geometric sequence
Find the next two terms: 1, 3, 9, 27, …
81, 243 (Geometric, r = ×3)
Classify –7/8 into all sets of numbers it belongs
Rational (Q)
√50 belongs to which sets of numbers?
Irrational (Q′)
Which number is both even and composite: 22, 29, 31, 37?
Numbers that cannot be written as a fraction and have non-terminating, non-repeating decimals are called what?
Irrational numbers
A sequence has terms 200, 100, 50, 25, … What are the next two
12.5, 6.25 (Geometric, r = ÷2)