Count up in jumps: to the next hour, on to noon, then to the end time. Add the jumps. Noon is where a.m. turns to p.m.
elapsed timehow much time passes
a.m.from midnight to noon
p.m.from noon to midnight
noon12:00 in the middle of the day
Watch for: Subtracting 1:15 − 9:40 as if the clock went past 12 to 13. Treating 60 minutes as 100 when regrouping. Writing 12:30 a.m. for half past noon.
At home: Note when a car trip or movie starts and ends, crossing noon. Work out together how long it lasted.
Sample sheet and answer key
Luna's Space Adventure
Grade 4 · Elapsed time across noon · 4.MG.2
NameDate
Astronaut Luna is exploring a far-off corner of space. Solve each problem to help Luna's mission go smoothly!
a.m. or p.m.?
a.m. is midnight to noon; p.m. is noon to midnight.
Eat breakfast at 7:30a.m.p.m.
Wake up at 6:50a.m.p.m.
Start school at 8:10a.m.p.m.
Play at the park at 4:30a.m.p.m.
How long?
Count up to noon, then on to the end time.
10:25 a.m. to 3:50 p.m.
10:45 a.m. to 2:50 p.m.
8:30 a.m. to 1:25 p.m.
8:55 a.m. to 3:35 p.m.
11:10 a.m. to 2:30 p.m.
10:40 a.m. to 2:55 p.m.
8:30 a.m. to 4:05 p.m.
8:30 a.m. to 2:25 p.m.
When does it end?
Add the hours, then the minutes. Watch for noon.
9:25 a.m. + 7 h 5 min
9:05 a.m. + 4 h 40 min
10:20 a.m. + 2 h 45 min
11:20 a.m. + 1 h 55 min
11:45 a.m. + 4 h 55 min
11:25 a.m. + 1 h 55 min
When did it start?
Count back from the end time.
1 h 31 min before 12:46 p.m.
7 h 31 min before 3:16 p.m.
5 h 33 min before 1:01 p.m.
6 h 29 min before 3:13 p.m.
Story time
1
How many minutes long is a movie that starts at 11:45 a.m. and ends at 1:30 p.m.?
minutes
Grade 4 · Sheet
Luna's Space Adventure
Grade 4 · Elapsed time across noon · 4.MG.2
Answer key
Astronaut Luna is exploring a far-off corner of space. Solve each problem to help Luna's mission go smoothly!
a.m. or p.m.?
a.m. is midnight to noon; p.m. is noon to midnight.
Eat breakfast at 7:30a.m.p.m.
Wake up at 6:50a.m.p.m.
Start school at 8:10a.m.p.m.
Play at the park at 4:30a.m.p.m.
How long?
Count up to noon, then on to the end time.
10:25 a.m. to 3:50 p.m.5 h 25 min
10:45 a.m. to 2:50 p.m.4 h 5 min
8:30 a.m. to 1:25 p.m.4 h 55 min
8:55 a.m. to 3:35 p.m.6 h 40 min
11:10 a.m. to 2:30 p.m.3 h 20 min
10:40 a.m. to 2:55 p.m.4 h 15 min
8:30 a.m. to 4:05 p.m.7 h 35 min
8:30 a.m. to 2:25 p.m.5 h 55 min
When does it end?
Add the hours, then the minutes. Watch for noon.
9:25 a.m. + 7 h 5 min4:30 p.m.
9:05 a.m. + 4 h 40 min1:45 p.m.
10:20 a.m. + 2 h 45 min1:05 p.m.
11:20 a.m. + 1 h 55 min1:15 p.m.
11:45 a.m. + 4 h 55 min4:40 p.m.
11:25 a.m. + 1 h 55 min1:20 p.m.
When did it start?
Count back from the end time.
1 h 31 min before 12:46 p.m.11:15 a.m.
7 h 31 min before 3:16 p.m.7:45 a.m.
5 h 33 min before 1:01 p.m.7:28 a.m.
6 h 29 min before 3:13 p.m.8:44 a.m.
Story time
1
How many minutes long is a movie that starts at 11:45 a.m. and ends at 1:30 p.m.?
15 + 60 + 30 = 105
105minutes
Answer key
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New problems every time, three levels (gentle, core and stretch), themes to pick from, a second page if you want one. Each sheet comes with an answer key and a one-page guide for grown-ups.
