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Download "Признаки делимости натуральных чисел на 2, 5 и 10. Практическая часть - решение задачи. 5 класс."

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математика
5класс
эльмирарафикова
делимость
деление
признакиделимости
натуральныечисла
числа
мектеп
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mektep
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  • ruRussian
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00:00:05
hello guys, 1 math teacher is here with you
00:00:08
and today you guys and I
00:00:11
are solving a task on the signs of
00:00:14
divisibility, you and I have gone through the
00:00:16
signs of divisibility well and today we are solving
00:00:19
the tasks see I wrote you a lot of
00:00:22
numbers from these numbers the task you need to
00:00:26
choose those numbers that are divisible by 2
00:00:31
2 for such a thought, we’ll write the column by 2,
00:00:34
so we’ll write the column by 5 and on is,
00:00:41
but first of all you need to remember the
00:00:46
sign of division by 2 numbers are divisible by 2
00:00:51
only when the last digit
00:00:59
is even or we say 0 2 4 6 8 numbers are
00:01:09
divisible by 2 only in if
00:01:12
they are even numbers
00:01:16
they are reportable numbers only when
00:01:19
they have the last digit 0 2 4 6 or 8 6
00:01:27
or 8 that is, we look at the last
00:01:30
digit and let's reason the
00:01:33
number 144 look at the last digit
00:01:37
last digit 4 even digit to even
00:01:42
means divisible by 2 before is divisible 144
00:01:46
entries
00:01:47
173 look at the last digit 3 even
00:01:52
digit no odd
00:01:54
means the number 173 odd means it is not
00:01:59
divisible further 184 last digit 4 is an
00:02:05
even digit and the number is even means it is
00:02:11
divisible 184
00:02:15
278 last digit eight even digit
00:02:19
before even means the number 278 even means
00:02:25
it is divisible by 2 278
00:02:30
further 391 last digit 1 odd
00:02:35
means not divisible 415 last digit
00:02:40
five odd means not divisible
00:02:44
520 last digit 0 means divisible
00:02:48
0 here you have it but I honestly write down
00:02:52
520 further 646 what is the last digit
00:02:56
six
00:02:57
six even to even means it
00:03:01
was written down 646
00:03:05
825 what is the last digit k5 it is even
00:03:09
no it is odd significant we do not write it down
00:03:14
990 the last digit 0 even digit
00:03:19
means the number is even
00:03:22
means it is divisible 990 is written down 975
00:03:31
what is the last digit five it is an even
00:03:34
digit
00:03:35
no it is odd means the number is not
00:03:38
divisible by 2 997 again the last digit to
00:03:45
7 is an odd digit, which means she is not a child;
00:03:49
we don’t have more numbers. I
00:04:10
also made it up I wrote it down now let’s remember the test of
00:04:14
divisibility by 5 only those numbers are divisible by 5
00:04:17
if the last a
00:04:20
digit is 0 or 5 or 5 the last digit is 0
00:04:33
or 5 let’s find the numbers whose
00:04:36
last digit is 0 here the last digit is
00:04:39
0 no here no here no no no 415
00:04:49
look the last number we have is 5 here
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we have five the last cypher fits
00:04:54
this rule until it fits I write here 415
00:04:58
further 520 look at the last number
00:05:02
zero again stops me from 0 I
00:05:05
look 0 or 5 fits this rule
00:05:07
until it fits I write it down 520 646 does not
00:05:12
fit 825 yeah the last digit is five with
00:05:16
the meaning I write down 825 990 the last
00:05:23
digit zero fits corrected to
00:05:24
fit 990
00:05:26
and 975 the last digit is 5 pay
00:05:34
attention I’m writing to you
00:05:37
0 2 4 6 8 I only have the last digits
00:05:40
and those that are written here the
00:05:42
last digit 0 or 5 the last digits are
00:05:45
only 0 and 5 I’m not inventing anything else
00:05:48
beyond 10 what is our rule the
00:05:51
last digit is the
00:05:55
digit 0 just have to see what
00:05:59
numbers we have ending with zero 520 I
00:06:04
write it down and 990
00:06:09
all the guys I followed the rules exactly what
00:06:14
I was told to do I every now and then, and
00:06:17
now guys, pay attention to
00:06:20
this moment, look at the number 520,
00:06:24
it’s divisible by 2, you see, I wrote it down, it’s
00:06:28
divisible by 5, and it’s divisible by 10. This happens, that is,
00:06:32
if you wrote some number in one column,
00:06:34
it’s not it means that it will not fall into the
00:06:37
other column,
00:06:38
check carefully, this is how you and I
00:06:40
checked each number together, we
00:06:43
checked and wrote it down, that’s all, that is,
00:06:47
you need to clearly know the rules, these
00:06:49
rules apply, don’t invent anything, and
00:06:52
well, a little trick, yes, if the number
00:06:54
ends in zero, look, it’s
00:06:57
divided both 5 and 2, that is, if you
00:07:02
see a number that has a
00:07:03
zero at the end, feel free to write it down as 20,
00:07:07
but in general, of course, in any case, until
00:07:09
you have enough practice,
00:07:11
check each number according to the rules,
00:07:14
don’t invent anything, I hope everything
00:07:18
was clear to you on this in the lesson you learned
00:07:20
to determine how which of the numbers are divisible by
00:07:24
which of the numbers, well, that is, we took 2 5
00:07:27
10 and this concludes our lesson until
00:07:29
next time, goodbye
00:07:32
[music]
00:07:41
[music]

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