Week 09 · Time, mass and liquid volume
Tuesday
How much time passes?
// Minutes, grams, kilograms and liters
⏱ about 15 min
Tuesday: How much time passes?
Rosie plants bean seeds in a long, straight row.
She starts at 2:15 and finishes at 2:50.
"How long did I plant?" she asks, brushing soil from her paws.
Bennie draws a line in the dirt with a stick.
"This is a number line for minutes," he says.
"We jump from the start time to the end time."
"Then we add up our jumps."
Learn it: jump on a number line
Elapsed time is how much time passes from the start to the end.
Rosie starts at 2:15 and ends at 2:50.
Jump 30 minutes from 2:15 to 2:45.
Then jump 5 minutes from 2:45 to 2:50.
Add the jumps: 30 + 5 = 35. Rosie planted for 35 minutes.
Learn it: jump past the hour
From 3:40 to 4:10, jump to the hour first.
3:40 to 4:00 is 20 minutes. 4:00 to 4:10 is 10 minutes.
Add the jumps: 20 + 10 = 30 minutes.
HOW LONG DID IT TAKE?
- Read the question.
- Tap your answer.
Rosie plants seeds from 2:15 to 2:50. How long does she plant?
Bennie reads from 9:05 to 9:32. How long does he read?
Rosie rakes leaves from 3:40 to 4:10. How long does she rake?
The friends sing from 6:25 to 7:05. How long do they sing?
WHAT TIME WILL IT BE?
- Read the question.
- Tap your answer.
Bennie starts reading at 1:20. He reads for 25 minutes. When does he stop?
The garden walk starts at 10:45. It lasts 30 minutes. When does it end?
Rosie starts weeding at 4:08. She weeds for 17 minutes. When does she stop?
Supper starts at 5:50. It lasts 15 minutes. When does it end?
WHEN DID IT START?
- Read the question.
- Tap your answer.
Rosie finished watering at 3:30. She watered for 20 minutes. When did she start?
Bennie finished his puzzle at 8:15. It took 25 minutes. When did he start?
ADD AND SUBTRACT MINUTES
- Read the question.
- Tap your answer.
30 + 5 = ?
25 + 18 = ?
60 - 35 = ?
60 - 48 = ?
FIND THE TIME FROM 3:40 TO 4:10
- Think about the number line.
- Tap the steps in order.
1First
2Next
3Then
4Last
Jump to the next hour, then count the rest.
| Sentence | True or false? |
|---|---|
| From 2:15 to 2:50 is 35 minutes. | ? |
| From 9:50 to 10:10 is 30 minutes. | ? |
| 60 - 45 = 15 | ? |
| 1:20 plus 25 minutes is 1:45. | ? |
WHY THIS EXERCISEFrom 9:50 to 10:10 is 20 minutes: 10 to the hour, then 10 more.
Try it
Look at a clock when you start a chore.
Write down the start time.
Look again when you finish, and write the end time.
Jump on a number line to find how long it took.
Write down the start time.
Look again when you finish, and write the end time.
Jump on a number line to find how long it took.
Draw a number line from 3:40 to 4:10 with two jumps.
Well done! Tomorrow we weigh garden things in grams and kilograms.