# Operations With Whole Numbers

Whole numbers include the **positive counting numbers 1, 2, 3** and so on as well as **zero** and all the **negative numbers –1, –2, –3** etc.

The mathematical name for whole numbers is **integers**.

Mathematical operations are addition, subtraction, multiplication and division. Some of the words that we use for these operations include:

**Addition**- sum, more than, total, amount altogether

**Subtraction**- difference, less than, amount left, remainder**Multiplication**- product, total, amount altogether, lots of, of**Division**- quotient, shared number, per

## Example One - Addition

What is the sum of 345 and 678? (Line up the columns.)

**Answer:**

345 |

+ 678 |

1023 |

## Example Two - Subtraction

What is the difference between 678 and 345? (Line up the columns.)

**Answer:**

678 |

– 345 |

333 |

## Example Three - Multiplication

What is 64 × 25? (Multiply by 5 first, and then multiply by 20 which is 10 × 2.)

**Answer:**

64 |

× 25 |

320 |

+ 1280 |

1600 |

## Example Four - Division

Share 180 amongst 15 people.

**Answer:**

12 | |

15 | 180 |

–15↓ | |

30 –30 | |

0 |

## Question - How many teaspoons of sugar are in a can of cola?

The label of a 375 ml can of cola drink states that it contains 40 grams of sugar. One teaspoon contains about 5 grams. How many teaspoons of sugar is this?

**Answer**

8

## Maths Fun

Calculate these. What's the pattern? How do they work?

1 × 1 =

11 × 11 =

111 × 111 =

1111 × 1111 =

11111 × 11111 =

1 × 8 + 1 =

12 × 8 + 2 =

123 × 8 + 3 =

1234 × 8 + 4 =

12345 × 8 + 5 =