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Math length measurement in the second grade. Think about how to draw a straight line of six centimeters with a broken ruler.
Draw a 6 cm straight line after counting 6 cm with the scale point of a whole centimeter of broken ruler as zero point.

For example, take the scale point of 5 cm on the ruler as the zero point, and count 6 cm square from the back to the scale point of 1 1 cm, then it is 6 cm.

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