Mathematics · Quantitative Aptitude

Number Operations and Properties

974 Questions

Improve your quantitative aptitude with these number operations and properties questions. The topics range from basic subtraction and division to highest common factor and roman numerals. Regular practice of these fundamentals builds speed for exams.

Basic arithmetic operationsHCF and number propertiesRoman numeral calculationsNumber series evaluation

Number Operations and Properties Questions

Multiple choice

What is the valency of 52X24?
    • 2

  2. – 2
    • 1

  4. – 1
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Some elements, like the transition metals, have electronic configurations in which electrons from their inner shells can also be used as valence electrons; these elements can have several different oxidation states. Chromium can have a valency of +2, +3 or +6.

Multiple choice

If 2 = 5, 4 = 18, 6 = 39, then 10 is

  1. 45

  2. 81

  3. 100

  4. 105
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Pattern: n² + 1. For n=2: 2²+1=5. For n=4: 4²+1=17≈18 (approximation). For n=6: 6²+1=37≈39. Following the pattern n²+1 exactly for n=10: 10²+1=101. However, the options suggest a different pattern: n×(n+1)/2 + n, or perhaps n² + n/2 for odd n. Let me reconsider: 2×2.5=5, 4×4.5=18, 6×6.5=39, 10×10.5=105. The pattern is n×(n+0.5).

Multiple choice

If M = 13 and Y = 25, how can BEEF be written?

  1. 2446

  2. 3557

  3. 2556

  4. 3558
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

M is the 13th letter of the English alphabet and Y is the 25th letter. Based on this analogy, for BEEF we must have 2nd, 5th and 6th letters. Hence, 2556.

Multiple choice

Directions: Use the following program segment.

SELECT CASE Choice CASE 10 Price = Quantity * UnitPrice CASE 20 Price = Quantity * UnitPrice * 0.95 CASE 30 Price = Quantity * UnitPrice * 0.90 CASE ELSE PRINT "Invalid Choice." END SELECT

What happens if Choice equals 20?

  1. Price equals Quantity - UnitPrice.

  2. Price equals 95% of Quantity - UnitPrice.

  3. Price equals 90% of Quantity - UnitPrice.

  4. Invalid Choice is displayed.
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

When Choice equals 20, the CASE 20 block executes: Price = Quantity * UnitPrice * 0.95, which gives 95% of the original amount (a 5% discount).