Use addition:

15 + 12:

Line up our numbers vertically:

1 | 5 | |

^{+} | 1 | 2 |

1 | 5 | |

^{+} | 1 | 2 |

7 |

Column 1: 5 + 2 = 7

1 | 5 | |

^{+} | 1 | 2 |

2 | 7 |

Column 2: 1 + 1 = 2

Answer = **15 + 12 = ****27**

27

Free Basic Math Operations Calculator - Given 2 numbers, this performs the following arithmetic operations:

* Addition (Adding) (+)

* Subtraction (Subtracting) (-)

* Multiplication (Multiplying) (x)

* Long division (Dividing) with a remainder (÷)

* Long division to decimal places (÷)

* Partial Sums (Shortcut Sums)

* Short Division

* Duplication and Mediation

This calculator has 2 inputs.

* Addition (Adding) (+)

* Subtraction (Subtracting) (-)

* Multiplication (Multiplying) (x)

* Long division (Dividing) with a remainder (÷)

* Long division to decimal places (÷)

* Partial Sums (Shortcut Sums)

* Short Division

* Duplication and Mediation

This calculator has 2 inputs.

- addition
- math operation involving the sum of elements
- basic math
- Elementary math subject to help students understand fundamentals, before moving on to more difficult subjects
- basic math operations
- long division
- a standard division algorithm suitable for dividing multi-digit numerals that is simple enough to perform by hand.
- multiplication
- math operation involving the product of elements
- operations
- partial
- A part of a whole. Incomplete.
- remainder
- The portion of a division operation leftover after dividing two integers
- subtraction
- math operation involving the difference of elements
- sum
- the total amount resulting from the addition of two or more numbers, amounts, or items

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