By Asselin M.

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The subtraction of zero from any number will not alter that number. f) n − n = 0. Subtraction of any number from itself will always equal zero. g) n/0 = ? Division by zero is not deﬁned in mathematics. The commutative, associative and distributive laws We all know that 6 × 5 = 30 and that 5 × 6 = 30, so is it true that when multiplying any two numbers together, the result is the same no matter what the order? The answer is yes. The above relationship may be stated as: The product of two real numbers is the same irrespective of the order in which they are multiplied.

4 1. What is 15% of 50? 2. 5 million. Each year 10% of the value of the test equipment is written off as depreciation. What is the value of the equipment after two full years? 3. 25 hours and travels 1620 km. What is the aircraft’s average speed? 4. A car travels 50 km at 50 km/h and 70 km at 70 km/h. What is its average speed? 5. A car travels 205 km on 20 litres of petrol. How much petrol is needed for a journey of 340 km? 6. Four men are required to produce a certain number of components in thirty hours.

206077518 × 10−11 . The error in this very small number (compared with our estimation) is something like two in one thousand million! Of course, the errors for very large numbers, when squared or raised to greater powers, can be signiﬁcant! Simplify a) You might be able to provide an estimate for this calculation without converting to standard form. For the sake of completeness and to illustrate an important point, we will solve this problem using the complete process. 24 × 10−1 ). 27. In other words it is already in standard form!