Measuring lengths with different units
Measuring-lengths-with-different-units 256
Exercise Name: Measuring lengths with different units
Math Missions: Early math Math Mission, 3rd grade (U.S.) Math Mission
Types of Problems: 1

The Measuring lengths with different units exercise appears under the Early math Math Mission and 3rd grade (U.S.) Math Mission. This exercise uses rectangles and tick marks on a ruler to measure a given length and compares the size of the unit of measurement with how many it takes to make the measurement.

Types of Problems

There is one type of problem in this exercise:

  1. Use and compare rectangles and units: This problem gives a segment that is measured with rectangles and with a marked ruler. The width of the rectangles is either shorter or longer than the ticks marks on the ruler. The student has four answers to give, the length in rectangles, the length in units, how the rectangle size compares to the unit, and whether more or less rectangles were needed compared to the units.

    Use and compare rectangles and units


This exercise is easy to get accuracy badges because the measurements are not large. The speed badges are medium because of the many answers that are required.

  1. If the rectangles are smaller than the unit, then it takes more to measure. If the rectangles are larger than the unit, then it takes less of them to measure. This can provide some default answers as long as students do part of the problem and still emphasizes the connection between size and quantity as desired.

Real-life Applications

  1. Measurements are used for many things, such as cooking, and for placing carpet.
  2. The ancient Egyptians from over 4000 years ago were very good at shapes and geometry. Every time the Nile burst its banks and flooded the planes, they had to use geometry to measure their gardens and fields all over again.

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