# Multiplication

It helps to know your times tables! **Click** on the times tables picture.

## Muliplying by 10

A decimal point comes after a whole number e.g. 3.4 - the number three is a whole number.

Move the decimal point one place to the right.

## Example 1

2 x 10 = ?

Move the 2 from the units to the tens column.

Answer:20

## Example 2

8.3 x 10= ?

Move the 8 from the units to the tens column and .3 to the units column.

Answer:83

## Muliplying by 100

Move the number or numbers two places to the right.

## Example 1

5 x 100 =?

Move the 5 from units to the hundreds column.

Answer:500

## Muliplying by 1000

Move the decimal point three places to the right.

2.2 x 1000 = ?

Move the 2 from units to the thousands column and .2 to the hundreds column.

Answer:2,200

# Muliplying Numbers

## Example 1

22 x 6 = ?

- Start with the units! Mulitply

2 by 6 = 12 - Enter 2 and carry 1 to the tens
- Multiply the 2 in the tens coloumn

by 6 = 12 - Plus the 1 carried over = 13
- Enter 3 in the tens column and

carry 1 over to the hundreds column

Th | H | T | U |
---|---|---|---|

2 | 2 | ||

6 | |||

1 | 3 | 2 | |

1 |

x

## Example 2

43 x 11 = ?

- Multiply 43 by 1 = 43
- Multiply 43 by 10= 430
- Add 43 + 430 = 473

Th | H | T | U |
---|---|---|---|

4 | 3 | ||

1 | 1 | ||

4 | 3 | ||

4 | 3 | 0 | |

4 | 7 | 3 | |

x

## Example 3

343 x 32 = ?

- Multiply 343 by 2 = 686
- Multiply 343 by 30= 10,290
- Add 686 + 10290= 10,976

Th | H | T | U |
---|---|---|---|

3 | 4 | 3 | |

3 | 2 | ||

6 | 8 | 6 | |

10, | 2 | 9 | 0 |

10, | 9 | 7 | 6 |

x

# VIDEO

Have a look at the demonstration on the video to enhance your learning.