Cogito
Grade 2 Math · Chapter 8 · Lesson 2
A.M. and P.M.
Two threes in every day.
10 problems · about 11 minutes · 2.MD.C.7
What this lesson teaches
The child uses a.m. and p.m. to say which part of the day a time belongs to.
- A day has 24 hours but the clock shows 12.
- A.m. is midnight to midday. P.m. is midday to midnight.
- Every time on the clock happens twice a day.
Warm-Up Review
From earlier lessons. Loosen up before the new work.
3 problemsReview — Time to Five Minutes: The long hand is on the 5. How many minutes past?
Answer 25
Why The 5 means 25 minutes.
Review — Line Plots: 2 marks at 4, 5 at 5, 1 at 6. How many things in all?
Answer 8
Why 2 + 5 + 1 = 8.
Review — Bar Graphs: Bars of 10 and 6. How many more is the first?
Answer 4
Why The difference is 4.
Warm Up
Straightforward practice. Get the method working first.
3 problemsIs 3 o’clock in the afternoon a.m. or p.m.?
Answer p.m.
Why Afternoon times are p.m.
How many times does the clock show 3 o’clock in one day?
Answer 2
Why Every time happens twice a day.
Lunch at 12:30 in the middle of the day.
Answer p.m.
Why It is just after midday.
Build It Up
The same ideas with more to keep track of.
1 problemWaking up at 6:45 before school.
Answer a.m.
Why Before midday.
Stretch Yourself
Mixed problems. Work out what kind of question it is before you start.
3 problemsHow many hours are in a whole day?
Answer 24
Why Twelve twice.
Getting Up: School starts at 9 o’clock in the morning. Is that a.m. or p.m.?
Answer a.m.
Why Morning times are a.m.
Bedtime: Bedtime is at 8 o’clock at night. Is that a.m. or p.m.?
Answer p.m.
Why Evening and night times are p.m.