Grade 9 Mathematics Flashcard on Number Systems

Front

What is the set of natural numbers denoted by? Options: ℚ, ℝ, ℕ, ℤ

Back

ℕ

Front

Which of the following is a prime number? 8, 7, 4, 6

Back

7

Front

GCF of 30 and 45?

Back

15

Front

Which of the following numbers is irrational? √16, √4, √2, √9

Back

√2

Front

What is the least common multiple (LCM) of 4 and 6?

Back

12

Front

Which of the following is a terminating decimal? 1/7, 1/3, 2/5, 5/9

Back

2/5

Front

Prime factorization of 60?

Back

2 × 2 × 3 × 5

Front

Which of the following is a composite number? 2, 3, 9, 5

Back

9

Front

What is the sum of a rational number and an irrational number?

Back

Always irrational

Front

Which of the following numbers is irrational? −1.5, 3/4, √2, 0.75

Back

√2