# Open University MU123 Discovering Mathematics Unit 1 Mindmap

?
• Created by: SHarley98
• Created on: 30-04-20 17:14
• 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.

## Comments

No comments have yet been made

## Similar Mathematics resources:

See all Mathematics resources »See all Open University MU123 Discovering Mathematics Unit 1 resources »