0.4⋅100

Multiply 0 by 4. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 |

Multiply 0 by 0. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 |

Multiply 0 by 4. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 |

Multiply 0 by 0. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 |

Multiply 1 by 4. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

4 |

Multiply 1 by 0. Place the result in the next column in the result line. There is one result line for each digit in 100.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

0 | 4 |

Add the numbers in each column. In this case, add 0+0+0, then place the 0 in the result line.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

0 | 4 | ||

0 |

Add the numbers in each column. In this case, add 0+0+0, then place the 0 in the result line.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

0 | 4 | ||

0 | 0 |

Add the numbers in each column. In this case, add 0+0+4, then place the 4 in the result line.

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

0 | 4 | ||

4 | 0 | 0 |

0 | .4 | ||

⨯ | 1 | 0 | 0 |

0 | 0 | ||

0 | 0 | ||

0 | 4 | ||

4 | 0 | 0 |

To find the number of decimal places needed in the answer, add the number of decimal places in the multiplier and multiplicand. In this case, there is a total of 1, so the answer must have 1 decimal places as well.

40

Multiply 0.4*100