The content is very simple, but many people get confused at the time of the test due to the excessive use of calculators on a daily basis.

Good study!

Addition is the most basic of mathematical operations. It is linked to the idea of ​​joining or adding.

Example:

Pedrinho had 5 reais and won 2 more from his mother. Of course, Pedrinho got 7 reais.

The symbol used to represent the addition is the (+) . Look:

5 + 2 = 7

In this example, we say that 5 and 2 are plots and 7 is the sum.

PLOT + PLOT = SUM

THE ALGORITHM

The structure of the sum algorithm is as follows:

To use the algorithm, the plots must be positioned from right to left, so that we add the units first, then the tens, hundreds, etc.

• The order of the plots does not change the sum, that is, it does not matter the position of each of the plots in the algorithm;
• The algorithm can be used to add as many plots as needed, not just two.

Example 1. Add 231 and 465.

Units: 1 + 5 = 6

Dozens: 3 + 6 = 9

Hundreds: 2 + 4 = 6

Example 2. Adding 142 and 3046

Units: 2 + 6 = 8

Dozens: 4 + 4 = 8

Hundreds: 1 + 0 = 1

Thousands: 0 + 3

Example 3. Add 234 and 148

We now have a special case. When we add the units (4 + 8 = 12), we get a 2-digit number. In this case, the figure 2 will also be the sum figure, while 1, which represents a ten, will be placed on the tens column (the famous “goes one”).

Units: 4 + 8 = 12 (we consider only 2)

Dozens: 1 + 3 + 4 = 8

Hundreds: 2 + 1 = 3