Add and subtract integers

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Interactive exercises are generic, application compiles a new series of tasks each time you start.

INTERACTIVE EXERCISES

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Number of tasks: | {{(plynum)}} |

Difficulty: | {{resdifi}} |

RESULT

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Date: | {{timest * 1000 | date:'dd.MM.yyyy HH:mm:ss'}} |

Num. of tasks: | {{(anscor+answro)}} |

Difficulty: | {{resdifi}} |

Correct answers: | {{anscor}} |

Wrong answers: | {{answro}} |

Efficiency: | {{anscor/(anscor+answro)*100|number:0}} % |

Time: | {{tmdur}} s |

Time per task: | {{tmdur / (anscor+answro)|number:1}} s |

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CHOOSE TYPE OF TASKS

Add and subtract integers

Add and subtract two integers.

Add and subtract two integers.

Add and subtract integers - expression

Remove the parentheses and calculate.

Remove the parentheses and calculate.

EXAMPLE OF A TASK

-52 + (-14) =

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Proportion of correct answers (in %) for the last {{chrAnum}} exercises.

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The rules for adding and subtracting integers.

The rule | Example |

+(+a) = a | +(+7) = +7 |

+(−a) = −a | +(−5) = −5 |

−(+a) = −a | −(+9) = −9 |

−(−a) = +a | −(−4) = +4 |

The rules for removing parentheses

EXAMPLE

Remove the parentheses.

Numbers within the parentheses RETAIN the sign.

4 − 7 + 2

EXAMPLE

Remove the parentheses.

Numbers within the parentheses CHANGE the sign.

Change +4 to −4 and −5 to +5.

2 − 4 + 5

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