Cogito
Grade 1 Math · Chapter 9 · Lesson 9
Telling Time to the Half Hour
Half past is exactly half of the way round.
10 problems · about 14 minutes · 1.MD.B.3, 1.G.A.3
What this lesson teaches
The child reads and writes half-past times, and connects the half-hour to the halves learned earlier in the chapter.
- Half past means the long hand went half way round.
- The short hand sits between two numbers.
- Read the number it has already passed.
- Half past 3 is written 3:30.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
4 problemsReview — Telling Time to the Hour: Short hand on 4, long hand up. What hour?
Answer 4
Why It is 4 o’clock.
Review — Fourths and Quarters: How many fourths make one whole?
Answer 4
Why 4 fourths make the whole.
Review — Halves: How many equal shares are in a half?
Answer 2
Why A half is one of 2 equal shares.
Review — Shapes Inside Shapes: How many triangles make one trapezoid?
Answer 3
Why A trapezoid is 3 triangles.
Warm Up
Straightforward practice. Get the method working first.
3 problemsHow many minutes is half an hour?
Answer 30
Why Half an hour is 30 minutes.
Short hand between 6 and 7, long hand down. What time?
Answer Half past 6.
Why 6 has started, so it is half past 6.
How many minutes is half an hour?
Answer 30
Why Half of 60.
Build It Up
The same ideas with more to keep track of.
1 problemAt half past 5, where is the short hand?
Answer Between 5 and 6.
Why It moves as the minutes pass.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
2 problemsHow is half past 8 written?
Answer 8:30
Why Half an hour is 30 minutes.
Lunchtime: The short hand is between 12 and 1, long hand down. Which hour?
Answer 12 half past
Why It is half past 12, written 12:30.