Number System (Class 6–8)

Integers, rational numbers, real numbers, square/cube roots, exponents.

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Q1 · Number System (Class 6–8) · EASY
A student is asked to find the value of (-8) × 5 + 12 ÷ (-3). What is the correct answer?
Q2 · Number System (Class 6–8) · EASY
The rational number 3/7 lies between which two consecutive integers?
Q3 · Number System (Class 6–8) · MEDIUM
If 2^x = 32 and 3^y = 81, what is the value of x + y?
Q4 · Number System (Class 6–8) · MEDIUM
A tank can be filled by pipe A in 6 hours and by pipe B in 8 hours. If the capacity of the tank is 120 litres, how many litres per hour does pipe A fill more than pipe B?
Q5 · Number System (Class 6–8) · HARD
The cube root of 0.000064 is equal to which of the following?