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Download "Урок 16 единица длины – сантиметр Математика 1 класс"

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урок
16
единица
длины
сантиметр
математика
класс
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  • ruRussian
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00:00:03
[music]
00:00:18
carefully look at the picture,
00:00:21
what you see in front of you are three lines of
00:00:24
different colors, fantasize
00:00:26
and turn these lines into geometric
00:00:29
shapes,
00:00:30
we won’t change the first line because it’s
00:00:33
already a geometric figure, a line
00:00:36
that has neither beginning nor end
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is called a straight line, let’s put it on the second line at the
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beginning the point will turn out to be a ray of a ray
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there is a beginning but no end
00:00:47
and for the third line we put points at
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both ends
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then this line becomes a segment it has a
00:00:56
beginning and an end marked what can you
00:01:00
say about the length of these geometric
00:01:02
figures the
00:01:03
length of the figures are completely different lengths 2
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figures are less than the length of 3 figures a length 3
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is less than 1
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what is length is the distance from one
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end of an object to the other and how much is the
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length of the yellow figure greater than the length of the red one
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and here a new question appears: how much of
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what look at the image
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count how many red stripes
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fit on the yellow segment red
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measure fits on the yellow segment
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four times how many white strips
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are placed on a yellow segment; a
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white measure is placed on a yellow segment
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three times; why does this happen; the
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length of the strips is different; therefore, such measures are
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not suitable for measuring length;
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mathematics is an exact science;
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therefore, to measure length in does not
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use a special accurate measure
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called a centimeter; centimeter is a
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long word; therefore all over the world
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they agreed to briefly designate centimeters
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as c m to measure segments
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they use a precise instrument a ruler
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what number does the ruler start from zero
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the ruler should lie under the segment a0
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should coincide with the beginning of the segment
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so that each time
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we measure a segment we don’t have to count the centimeters on the ruler are
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indicated by numbers in order
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the length of our segment the length of the
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segment is 8 centimeters take a ruler and
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practice measuring and drawing
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segments of a given length yourself look at the drawing and
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name those figures whose
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length cannot be measured with a ruler correctly figures
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numbered 1 3 and 4
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cannot be measured with a ruler
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Today in the lesson we got acquainted with the
00:03:06
measure of length centimeters

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