0.4⋅10

Multiply 0 by 4. Place the result in the next column in the result line. There is one result line for each digit in 10.

0 | .4 | |

⨯ | 1 | 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 10.

0 | .4 | |

⨯ | 1 | 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 10.

0 | .4 | |

⨯ | 1 | 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 10.

0 | .4 | |

⨯ | 1 | 0 |

0 | 0 | |

0 | 4 |

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

0 | .4 | |

⨯ | 1 | 0 |

0 | 0 | |

0 | 4 | |

0 |

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

0 | .4 | |

⨯ | 1 | 0 |

0 | 0 | |

0 | 4 | |

4 | 0 |

0 | .4 | |

⨯ | 1 | 0 |

0 | 0 | |

0 | 4 | |

4 | 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.

4

Evaluate 0.4*10