Study guide: Read Clocks and Make Equal Shares
Tell hours and half-hours and partition wholes into halves or fourths.
Ideas to explain in your own words
- On an analog clock, the shorter hand names the hour.
- Half an hour is thirty minutes.
- Equal shares must cover the whole and have equal area.
- Dividing the same whole into more equal shares makes each share smaller.
Useful vocabulary
- half-hour
- Thirty minutes, half of an hour.
- fourth
- One of four equal shares of a whole.
Watch your reasoning
- At an exact hour, a minute hand at twelve means :00.
- Use the earlier hour; the next hour has not begun.
- Unequal pieces do not all receive the same fraction name.
- A larger denominator means smaller equal pieces of the same whole.
A worked review example
The short hand points to 7 and the long hand points to 12. The time is 7:00. The long hand’s twelve means the hour has just begun; it does not mean twelve minutes. Reading only the long hand would miss which hour is shown. Identify the shorter hour hand before reading its position. At an exact hour, a minute hand at twelve means :00. Sketch a clock with a clearly shorter hour hand and longer minute hand.
Make a practice plan
- Read an Hour on a Clock: Short hand at 10, long hand at 12: expected time 10:00.
- Read a Half-Hour Clock: Hour hand halfway between 9 and 10 with minute hand at 6: expected 9:30.
- Partition a Whole into Equal Halves or Fourths: Split one rectangle into two equal strips and another into four. Expected names: halves and fourths.
- Compare Shares of the Same Whole: Compare one fourth and one half of an identical circle. Expected: half is larger.