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# Year 9 Maths Study

### Year 9 Half Yearly Exams Study

Question | Answer |
---|---|

When we add, subtract or multiply whole numbers, the answer is always a ... number. | Whole |

We can compare the sizes of fractions if they have a ... denominator. | Common |

When adding or subtracting fractions, the ... must be the same. | Denominators |

When the numerator and denominator of a fraction cannot be divided exactly by the same whole number, the fraction is in ... form. | Simplest |

When multiplying fractions, multiply the numerators and ... the denominators. | Multiply |

When multiplying mixed numerals, first change them to ... fractions. | Improper |

To obtain the reciprocal of a number, write the number as a fraction and turn it ... down. | Upside |

To divide by a fraction, multiply by its ... | Reciprocal |

Quantities can be compared by expressing one quantity as a fraction of another ... | Quantity |

Decimal places are based on powers of ... | Ten |

The term 'decimal places' refers to the number of ... after the decimal point in a decimal number. | Digits (or Figures) |

Zeros at the end of a whole number or at the beginning of a decimal are ... significant. | Not |

Zeros between non-zero digits or zeros at the end of a decimal ... significant. | Are |

Some decimals repeat or ... Other decimals terminate. Some decimals do neither. | Recur |

To convert either a fraction or a decimal to a percentage, multiply by ... | 100% |

To convert a percentage to a decimal, divide by ... | 100 |

To convert a percentage to a fraction, divide by 100 then ... (if possible) | Simplify |

The unitary method involves finding the value of ... part or item when given the value of several parts or items. | One |

Add and subtract ... ... only | Like terms |

Instead of writing 8 x b x d, we write ... | 8bd |

In an algebraic expression, we can replace the variables with numbers to obtain a value for the expression. This process is called ... | Substitution |

3(4+7) can also be written as ... | 3 x (4+7) |

When expanding an expression, each term inside the brackets is ... by the term outside the brackets. | Multiplied |

A factor is a number or algebraic expression that divides ... into another whole number or algebraic expression. | Evenly |

Factorising is the ... of expanding. | Reverse |

If the denominators are not the same when adding or subtracting fractions, then we must convert them so that the fractions have a ... denominator. | Common |

When you are multiplying and dividing fractions, the denominators ... ... need to be the same. | Do not |

When multiplying fractions, cancel any common factors, then ... numerators and denominators. | Multiply |

When dividing by a fraction, multiply by its ... | Reciprocal |

One kilometre = ... m | 1000 |

One metre = ... cm | 100 |

One centimetre = ... mm | 10 |

One tonne = ... kg | 1000 |

One kilogram = ... g | 1000 |

One gram = ... mg | 1000 |

One hectare = ... metres squared | 10000 |

One metre squared = ... centimetres squared | 10000 |

One metre cubed = ... centimetres cubed | 1000000 |

One megalitre = ... kilolitres | 1000 |

One kilolitre = ... litres | 1000 |

One litre = ... millilitres | 1000 |

One centimetre cubed = ... millilitre | 1 |

One metre cubed = ... litres | 1000 |

One day = ... hours | 24 |

One hour = ... mins | 60 |

One hour = ... seconds | 3600 |

One minute = ... seconds | 60 |

A squared + B squared = ... squared | C |

Perimeter = The sum of all ... of a plane shape | Sides |

The perimeter of a circle is called the ... | Circumference |

Circumference = ... | Pie x diameter |

A relationship between two variables x and y whose graph is a striaght line is called a ... relationship. | Linear |

The expression of a linear relationship as an algebraic formula is called a ... equation. | Linear |

Gradient = Vertical rise divided by ... | Horizontal run |

Data that is collected is either categorical or ... | Quantitative |

Categorical data is information that can be put into different ... | Categories |

Quantitative data is information that is represented by numbers. This data can be discrete or ... | Continuous |

Discrete data is obtained through counting. "In-between" values are not ... | Possible |

Continuous data is obtained through ... The values for this type of data are on a smooth continuous scale. | Measuring |

A histogram is a graph that uses the height of the column to show the ... of each score. | Frequency |

An easy way of displaying a small set of scores is to draw a number line with dots or crosses drawn above the numbers to ... the scores. | Represent |

Range = highest score ... lowest score | Minus |

Mean = Sum of scores ... number of scores | Divided by |

The median is the ... score or can be the average of the two middle scores. | Middle |

The mode is the score that occurs most ... | Often |