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The **add ** is the first of the fundamental operations of arithmetic. It is represented with the symbol ** " + " **.

It consists of increasing a specific number

The numbers we've added are called addends, in Spanish

To add several numbers, we are going to put them underneath each other so that they match the units, tens, hundreds etc ... Draw a line under the last addends and orderly proceed to add all columns, starting with the units, then tens and so on until we reach the last column.

7 | 6 | 5 | 3 | ||

3 | 7 | 8 | 2 | ||

+ | 9 | 2 | 1 | 4 | |

________________ | |||||

2 | 0 | 6 | 4 | 9 |

**3 + 2 + 4 = 9**, We put the**9**under the units.**5 + 8 + 1 = 14**, We put the**4**under the tens and we "store" (carry) 1 that will add to the next column.**6 + 7 + 2 = 15**, 15 + 1 (which we carried) = 16. We put the**6**under the hundreds and we "carry" 1 that will add to the next column.**7 + 3 + 9 = 19**, 19 + 1 (which we carried) = 20. As we have no columns to add, we put the 20.

And we have already concluded:** 7.653 + 3.782 + 9.214 = 20.649 **

(twenty thousand six hundred and forty-nine)

The games in the menu will help you to practice sums.