Adding and subtracting time

Using digital and analogue clocks simultaneously to show different times in the day.

Calculating hours, minutes and seconds (signed)

Calculating how many seconds a zoo-keeper spends at work each day.

How to read a clock

How to read the time on an analogue clock and calculate time intervals.

How to read a clock (signed)

How to read the time on an analogue clock and calculate time intervals.

Measuring temperature using a thermometer

A demonstration of how to measure the air temperature using a thermometer.

Measuring time (signed)

A look at how time was measured in the past.

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