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4. Strange Clocks
EEExxxeeerrrccciiissseee A mirror reflection is a shape, where the right and left are switched.
Type StudyEEExxxeeerrrccciiissseee If the clock moves 10 minutes slower every hour. For every hour, the minute
hand moves 50 minutes. After one hour passes, the minute hand will move 50
minutes, and the clock will read 12:50.
After two hours, the minute hand will move 50 minutes from 12:50, so the
clock will read 1:40.
If the reflection of the clock is drawn with the left switched with the right, the
original clock will show.
Jake finished cleaning at 2:40.
Jake began to clean at 2:00 and ended at 2:40, so he cleaned for
40 minutes.
Problem solving
1 Draw each of the original clocks that have the left and the right switched.
Sleeping time Wake up time
Will fell asleep at 10 and woke up at 7 am, so he slept for 9 hours.
9Answer Key
EEExxxeeerrrccciiissseee A mirror reflection is a shape, where the right and left are switched.
Type StudyEEExxxeeerrrccciiissseee If the clock moves 10 minutes slower every hour. For every hour, the minute
hand moves 50 minutes. After one hour passes, the minute hand will move 50
minutes, and the clock will read 12:50.
After two hours, the minute hand will move 50 minutes from 12:50, so the
clock will read 1:40.
If the reflection of the clock is drawn with the left switched with the right, the
original clock will show.
Jake finished cleaning at 2:40.
Jake began to clean at 2:00 and ended at 2:40, so he cleaned for
40 minutes.
Problem solving
1 Draw each of the original clocks that have the left and the right switched.
Sleeping time Wake up time
Will fell asleep at 10 and woke up at 7 am, so he slept for 9 hours.
9Answer Key
