Open University MU123 Discovering Mathematics Unit 1 Mindmap

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  • Created on: 30-04-20 17:14
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  • MU123    UNIT 1
    • Rounding Numbers
      • 1. Look at the digit immediately after where you want to round.
      • 2. Round up if this digit if 5 or more.
      • 3. It stays the same if it is 4 or less.
      • Significant Figures
        • The first significant figure of a number is the most important digit for telling you how big the number is.
        • Then the rules for rounding numbers should be applied.
    • Order of Operations
      • Brackets
      • Indices
      • Division
      • Multiplication
      • Addition
      • Subtraction
    • Percentages
      • To express a number as a percentage of another number: (first number)/(second number) x 100%
      • To calculate a percentage of a quantity, the percentage should be expressed as a fraction or decimal and multiplied by the quantity.
      • Increase/Decrease: (actual increase or decrease)/(original value) x 100%
    • Fractions
      • To find an equivalent fraction to a given fraction, multiply or divide the numerator and denominator by the same non-zero number.
      • When you divide the numerator and denominator of a fraction by a whole number of more than 1, this is called cancelling the fraction. When a fraction has been cancelled to the smallest form, it is said to be in its simplest form, or lowest terms.
      • To turn a mixed number to a top-heavy fraction:       1. Multiply the whole number by the numerator.   2. Add the numerator.    3. Then put this new number as the numerator.
      • To turn a top-heavy fraction to mixed number:       1. Divide the numerator by the denominator. 2. The answer is the whole number and the remainder is the numerator.
    • Converting Between Units
      • To convert to a larger unit, you must divide.
      • To convert to a smaller unit, you must multiply.
    • Negative Numbers
      • Adding and Subtracting
        • Adding a negative number is the same as subtracting the corresponding positive number.
        • Subtracting a negative number is the same as adding the corresponding positive number.
      • Multiplying and Dividing
        • If the signs are different, then the answer is negative.
        • If the signs are the same, then the answer is positive.


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