CBSE Class 9 numbersystems — practice questions
54 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice CBSE Class 9 numbersystems in the app →The set of natural numbers N starts at:The Indian mathematician who formally introduced ZERO as a number (with rules for arithmetic) in 628 CE was:A rational number is any number that can be written in the form p/q, where p and q are integers and:Which of these is an IRRATIONAL number?The set of real numbers ℝ consists of:Are natural numbers CLOSED under subtraction?By Brahmagupta's rules: a fortune (positive) multiplied by a debt (negative) gives:Which of these is NOT an equivalent fraction of −1/3?The DENSITY property of rational numbers states that:The famous Ishango bone (~20,000 BCE) is mathematically remarkable because it contains tallies grouped into:By Brahmagupta's laws, what is (−5) − (−3)?Find a rational number lying strictly between 1/4 and 1/3:Which fraction has a TERMINATING decimal expansion?Convert the repeating decimal 0.45̄ (45 repeating: 0.454545…) to the form p/q:Convert 0.16̄ (where only the 6 repeats: 0.16666…) to p/q:Ancient Indian mathematicians named powers of 10. According to the Vedas, the name for 10¹² was:The construction of a line segment of length √2 on the number line uses:The exact formula for π was first given as an INFINITE SERIES by which Indian mathematician (14th century)?In long division for 1/7, the possible non-zero remainders are 1, 2, 3, 4, 5, 6 (six values). The decimal of 1Is the AVERAGE of two rational numbers always a rational number?For which of the following fractions will the decimal expansion have a REPEATING (non-terminating) block?Aryabhata (499 CE) gave the approximation π ≈ 3927/1250. He also called this an 'āsanna' meaning:Whole numbers consist of:Which of these is the smallest natural number?Which of these is irrational?Convert 0.5 to a fraction:How many natural numbers are there?The product of two negative integers is:Convert 3/4 to a decimal:Which is the additive inverse of -7?Find a rational number between 0.3 and 0.4:The decimal expansion of 1/9 is:Compute 5/6 + 2/3:Which fraction is equivalent to -2/3?The decimal expansion of 7/8 is:What is the absolute value of -5/3?Convert 0.7̄ (7 repeating: 0.7777…) to a fraction:Find the distance between -3 and 5 on the number line:Which of the following can be written as a rational p/q in lowest terms with q having ONLY 2 as a prime factorThe product 22/7 × 7 equals:Compute (-3/5) × (10/9):Madhava's series for π is π = 4 − 4/3 + 4/5 − 4/7 + … . Approximating π using only the first FOUR terms gives:Why do we need q ≠ 0 in the definition of a rational number p/q?Which expression is INCORRECT?For two rational numbers a and b, which is ALWAYS rational?How many rational numbers are there between any two distinct rationals?The set of INTEGERS is denoted by the symbol:Using Brahmagupta's rules, the value of (-3) × (-4) is:A rational number is any number that can be expressed as:Which of the following pairs of rational numbers are EQUAL?To add 2/5 + 3/10, the first step is to:To divide (2/3) ÷ (3/10), the operation is equivalent to:The set of rational numbers Q is CLOSED under all of the following operations EXCEPT:The absolute value of -5/3 is: