1 00:00:40,079 --> 00:01:16,159 Good morning, good afternoon, good evening, let's go there with the natural numbers that we play in the first saga, the natural numbers, as we well observe, we are going to follow the red circle, the natural numbers are the basis of all the numerical sets of mathematics, 2 00:01:16,159 --> 00:01:22,159 We know how to use them, the operations that we can do with them and also the properties that they have. 3 00:01:22,159 --> 00:01:30,159 In this saga, which is number 1, they propose you to be able to read, write and decompose any natural number, 4 00:01:30,159 --> 00:01:35,159 also to order and round them, whether they are tens, hundreds, units of millions, etc. 5 00:01:35,159 --> 00:01:43,159 If we continue, we are going to check or we are going to see a conceptual map. 6 00:01:43,159 --> 00:01:51,290 conceptual map here we have the conceptual map which is the first thing we have to have in our 7 00:01:51,290 --> 00:02:00,569 notebook as soon as we start the saga we are going to see the concept the concept of natural number well 8 00:02:00,569 --> 00:02:07,849 they are expressions of values ​​of whole units they are increased from 1 to 1 from 0 it does not admit 9 00:02:07,849 --> 00:02:14,789 partition, that is, the natural numbers are not decimal numbers and they do not admit 10 00:02:14,789 --> 00:02:20,689 negative values or what is the same, only positive values ​​are expressed, so the 11 00:02:20,689 --> 00:02:25,169 natural numbers are all those numbers that start from zero onwards that are not 12 00:02:25,169 --> 00:02:30,969 the negatives and that do not admit the decimal numbers either. What is the function of these 13 00:02:30,969 --> 00:02:37,030 natural numbers? Well, counting, measuring, numbering, coding, etc. What we are 14 00:02:37,030 --> 00:02:42,349 tired and tired of doing throughout each of our days. How is the 15 00:02:42,349 --> 00:02:46,810 graphical representation? Remember, in a numerical line from zero, in this 16 00:02:46,810 --> 00:02:51,789 numerical line, it will start, imagine that it is this, it starts here, one, two, three, four, and 17 00:02:51,789 --> 00:02:57,569 there will never be an in-between because natural numbers do not accept decimal numbers. 18 00:02:57,569 --> 00:03:06,689 The order is always ordered from less, which would be the zero, to greater, depending on the occupation or the relative place it occupies. 19 00:03:07,250 --> 00:03:08,689 How are the orders in magnitude? 20 00:03:08,930 --> 00:03:20,889 Well, we see here, the small one would be unit, decen, centen, unit of milliard, decen of milliard, centen of milliard, unit of million, decen of million, centen of million, we know that there are more, but we are going to stay in this video until here. 21 00:03:20,889 --> 00:03:28,030 and the approximation we also remember that last year we saw by rounding when we observe a 22 00:03:28,030 --> 00:03:33,310 number we first have to know what we have to round it then if the next figure is 23 00:03:33,310 --> 00:03:40,509 less than 5 the number remains the same and if it remains the same up to that number all the following 24 00:03:40,509 --> 00:03:50,389 would be 0 and if it is 5 or greater than 5, the number to which we are rounding is increased 1 and 25 00:03:50,389 --> 00:03:57,150 remember that the truncation is maintained in order and but without rounding, that is, for example here 26 00:03:57,150 --> 00:04:03,849 it would be 49 let's see if we do it here very quickly or how big is this wait a moment 27 00:04:04,770 --> 00:04:17,269 we are going to erase this one second and we do for example 49 the truncation truncation would be equal to 28 00:04:17,269 --> 00:04:26,730 4 we forget about this they want us to truncate the units because this and in this case the 4.9 as 29 00:04:26,730 --> 00:04:33,829 the figure and the units as the following figure is greater than 5 the rounding would be approximately 30 00:04:33,829 --> 00:04:39,949 the same remember that it is not equal to 5 this taking into account that the natural numbers are not 31 00:04:39,949 --> 00:04:48,050 decimals is so that we remember how the rounding and the truncation we are going to erase all 32 00:04:48,050 --> 00:04:56,209 this quickly quickly quickly we are going to continue and we are going to see now what operations are the ones that 33 00:04:56,209 --> 00:05:05,300 we can do with natural numbers like this we have to copy it in our notebook the 34 00:05:05,300 --> 00:05:10,920 operations that we can do are sum that is also called addition and has 35 00:05:10,920 --> 00:05:14,160 various three properties specifically the associative the commutative and the 36 00:05:14,160 --> 00:05:19,019 neutral element that we will see within the saga subtraction subtraction that only 37 00:05:19,019 --> 00:05:23,899 maintains the neutral element we can also multiply and the properties are 38 00:05:23,899 --> 00:05:28,680 one more than the sum which is the associative distributive commutative 39 00:05:28,680 --> 00:05:32,680 and neutral element the division that we are also a little already 40 00:05:32,680 --> 00:05:40,360 tiredness and tiredness of doing, keep the neutral element in the divisor, the neutral element and the 41 00:05:40,360 --> 00:05:45,639 combined operations that we like so much that we always have to have a hierarchy, remember 42 00:05:45,639 --> 00:05:51,699 that first parenthesis, second multiplications and divisions and third sums and subtracts. Now in the saga 43 00:05:51,699 --> 00:05:58,040 we are going to go deeper and do exercises on this that we just saw here very quickly, remember.