Welsh Government



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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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