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Khotsi measured the volume of an irregularly shaped stone. He used a specially made tin can.

1. Khotsi measured the volume of an irregularly shaped stone. He used a specially made tin can. The can was made in the shape of a cylinder. It had a diameter of 6cm. The height was 15cm. 1 cm down from the open top, there was a spout.

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Khotsi measured the volume of an irregularly shaped stone. He used a specially made tin can.

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  1. 1. Khotsi measured the volume of an irregularly shaped stone. He used a specially made tin can. The can was made in the shape of a cylinder. It had a diameter of 6cm. The height was 15cm. 1 cm down from the open top, there was a spout. The spout pointed downwards (not upwards like a teapot spout). The spout tapered from a diameter of 2cm down to a narrower 1 cm. The spout was just 5cm long. DRAW Khotsi’s can according to the measurements given.

  2. 3 3 cm /ml cm /ml 2. 1. Khotsi filled the can with water so it flowed out of the spout. 2. Then he lowered a stone into the can. 3. He collected the water pushed out of the can 100 100 90 90 80 80 70 70 60 60 50 50 40 40 30 30 20 20 10 10 TAKE READINGS from the measuring cylinder. FIND the volume of Khotsi’s stone. DISCUSS how this apparatus works.

  3. 3 cm /ml 3. 100 Looking carefully, we can see the surface of the water rises at the edges. We read from the bottom. 90 80 50 70 60 45 cm 3 50 40 30 40 20 10 RECORD the volumes shown here. 50 50 40 40 50 50 40 40

  4. 4. Here is a pie chart showing the different numbers of things Khotsi measured using his volume can. 4 iron keys 8 stones 8 pieces of glass 12 brass screws COMPLETE the table below Fraction of total Objects Number Total number of objects altogether Objects made from iron Objects made from metal Objects made by humans Objects that will sink in water

  5. 3 3 3 cm /ml cm /ml cm /ml 5. Khotsi now wants to find the volume of some foam plastic. The foam floats on water. Akeda tells Khotsi to tie a metal key to the foam to make it sink. 100 100 100 90 90 90 80 80 80 70 70 70 60 60 60 50 50 50 40 40 40 30 30 30 20 20 20 10 10 10 RECORD your READINGS from the measuring cylinders CALCULATE the volume of the key ? CALCULATE the volume of the foam ?

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