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How to measure the length with fingers in primary school mathematics
Cm: Thumb and forefinger spread to the left and right.

One meter: Open your arms left and right.

One centimeter: the size of the index finger nail.

Same as above, one arm is about 55-65cm.

Measure the length of one finger first (roughly) to see how many fingers you have measured, and then multiply them. Generally around 7 cm.