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# Operations with Deci

### Math 6 Chapter 3 Vocabulary

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

decimal | Numbers that have digits in the tenths place and beyond. |

standard form | The usual way to write a number. Example: 321 |

Expanded form | The sum of the products of each digit and its place value. Example: (3 x 100) + (2 x 10) + (1 x ) = 321 |

inequality | A mathematical sentence indicating that two quantities are not equal. The symbols < and > are used in the mathematical sentence. |

equivalent decimals | Decimals that name the same number but may look different. Example: 0.8 = 0.80 |

the traditional way to round decimals | Underline the digit you are rounding to, look to the right. If the number to the right is greater than 5, add 1 to the underlined digit. If it is not, leave the underlined digit alone. Drop all digits after the rounded digit. |

clustering | A way to round decimals to estimate sums of a lot of addends. If all of the addends are close to the same number, make all of the addends the same number. |

front-end estimation | A way to round decimals for estimating sums or differences. Use only the numbers in the first or first and second place value. Example 192 + 373 = 100 + 300. |

Adding and subtracting decimals | Estimate solution before lining up the decimals to keep the place values in columns. |

Multiplying decimals | Estimate solution using a similar whole number math fact. Do not line up the decimals before computing. Count the number of decimal places to find out how many decimals is in your solution. Compare result to estimate. |

Dividing decimals | Estimate solution using a similar whole number math fact. Move your decimals an equal number of places in the divisor and dividend until the divisor is a whole number. Compare your quotient with your estimate. |