Welsh Government
[pic] [pic]
Key Terms:
Circumference – the distance measured around the edge of a circle or a round object
How old is the tree?
Follow the instructions to find out:
|What to measure |Instruction |Coniferous |Deciduous |
| |You will need: a measuring tape and calculator |[pic] |[pic] |
|Circumference |Measure the tree from the ground up to 1.5m and make a mark with the chalk. | | |
|[pic] |Use the measuring tape to measure the circumference. Round off your answer to | | |
| |the nearest whole number | | |
| | |meters |meters |
| |Convert your answer to centimetres | | |
| | | | |
| |Trees grow approximately 2.5 cm per year | | |
| |Divide by 2.5 | | |
| |Round off your answer to the nearest whole number | | |
| | | | |
| | | | |
| | |cm |cm |
| | | | |
| | | | |
| | |years |year |
How tall has the tree grown?
Follow the instructions to find out
|What to measure |Instruction |Coniferous |Deciduous |
| |You will need: a measuring tape and a calculator |[pic] |[pic] |
|Height |One person stands at the base of the tree. Another walks away from that person| | |
|[pic] |and at every 5 steps stops to see if they can see the top of the tree from | | |
| |between their legs. | | |
| |When the top of the tree can be seen the person stops and another person | | |
| |measures the distance between the person at the base of the tree and the person| | |
| |who can see the top of the tree between their legs. | | |
| |Round off your answer to the nearest whole number | | |
| | | | |
| | | |meters |
| | | | |
| |Convert your answer to centimetres |meters | |
| | | | |
| | | | |
| | |cm |cm |
How much wood is in the tree?
Follow the instructions to find out
Key Terms:
Volume – the amount of space something fills
Circumference – the distance measured around the edge of a circle or a round object
Diameter – a straight line that crosses a circle through the centre
Pi (π) – the number you get when you divide the circumference of any circle by its diameter – 3.14
Radius – a line from the centre of a circle to the circumference
|What to measure |Instruction |Coniferous |Deciduous |
| |You will need: a calculator |[pic] |[pic] |
|Diameter |Calculate: | | |
| |Circumference ÷ π | | |
| |Round to the nearest whole number | | |
| | |cm |cm |
|Radius |Use a calculator to calculate: | | |
| |Diameter ÷ 2 | | |
| |Round to the nearest whole number |cm |cm |
|Volume |Use a calculator to calculate: | | |
| |Radius x radius x π x height | | |
| |Round to the nearest whole number |cm3 |cm3 |
| | | | |
| |Convert centimetres to meters | | |
| | | | |
| | | | |
| | |m3 |m3 |
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