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Length Measurement Classification Exercise: Sort Values into Less Than 50cm and Greater Than 50cm
Mathematics
Grade 2 Primary School
Question Content
Sort these measurements into less than 50cm and greater than 50cm. The measurements are: 35cm, 2cm, 85cm, 45cm, 1m, 100cm
Correct Answer
< 50cm: 35cm, 2cm, 45cm; > 50cm: 85cm, 1m, 100cm
Detailed Solution Steps
1
Step 1: First, unify the unit of measurement. Since 1m = 100cm, convert 1m to 100cm to make all values use centimeters as the unit.
2
Step 2: Compare each measurement with 50cm one by one: 35cm < 50cm, 2cm < 50cm, 85cm > 50cm, 45cm < 50cm, 100cm > 50cm, 100cm > 50cm.
3
Step 3: Classify the values according to the comparison results: put 35cm, 2cm, 45cm into the < 50cm group; put 85cm, 1m, 100cm into the > 50cm group.
Knowledge Points Involved
1
Unit Conversion of Length
It refers to converting between different units of length. In this problem, we convert meters to centimeters using the conversion rule: 1 meter = 100 centimeters. This is used to unify units for accurate size comparison.
2
Comparison of Integer Sizes
It is the method of judging the magnitude relationship between two integers. For positive integers, the number with more digits is larger; if the number of digits is the same, compare the digits from the highest to the lowest. Here we compare the centimeter values with 50 to classify them.
3
Data Classification
It is the operation of sorting data into different groups according to given standards. In this problem, the standard is whether the length is less than or greater than 50cm, and we sort the given length data into two corresponding groups.
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