Equal Inches
Purpose:
Students will begin measuring with nonstandard units and discover the need for a standard unit of measure.
Students will learn to measure to the nearest inch using an inch ruler correctly and record their results.
Materials:
8 to 10 assorted color strips of paper of various lengths (to the nearest inch); one set per 2 to 4 children. Sets should be identical.
Paper clips (small, regular, and jumbo sizes)
Inch rulers
Activities:
Introduce activity by telling students that they will be using paper clips to measure the strips of paper in their bags. They will need to leave the paper clips on the strips so they can record their measures and others can observe their measures.
Partners lay their set of paper strips on their workspace and measure each using the paper clips you give them.
Partners record the color and length of each strip on their paper.
After partners a refinished measuring, ask each group for their measure for a particular color paper and record on the board. Immediately students will disagree with the measure. State that we will record all the measures and later we can come back to figure out the problem. Next, I suggest that we try another color and repeat the process.
After we find differing measurements for several of the different colored paper strips, instruct students to carefully walk around and look at what other groups have done. Students quickly see that the differing measurements are due to the size of the paper clips used.
Distribute rulers to students. Discuss leading edge if your rulers have this. Remind students to record inch after each measure.
Measure the color strips with a ruler.
After groups are finished measuring, compare measures for each color strip and note how much more accurate the information is when we all used the same standard unit. If measures do not match, this is an excellent time to have students work to find out why they do not match (usually due to the leading edge on ruler, or some students begin with the number 1 on ruler)
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