Number System (Class 6–8)

Integers, rationals, real numbers and operations.

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Q1 · Number System (Class 6–8) · EASY
A student says: 'If I multiply two negative integers, the product is always positive.' Is this statement true or false?
Q2 · Number System (Class 6–8) · MEDIUM
Simplify: (-15) ÷ 5 + 3 × (-2)
Q3 · Number System (Class 6–8) · MEDIUM
A rational number is represented as p/q, where p and q are integers and q is not equal to 0. Which of the following is NOT a rational number?
Q4 · Number System (Class 6–8) · HARD
If a = -5, b = 3, and c = -2, then find the value of: (a × b) - (b × c) + (c × a)
Q5 · Number System (Class 6–8) · EASY
What is the HCF (Highest Common Factor) of 24 and 36?