Elapsed Time — Answer Key
Part A: Fix the Sentence
Each sentence has an error. Rewrite it correctly on the line.
1. Fix the sentence:
In Grade 3, from 2:55 to 3:20 is 15 minute.
Corrected: In Grade 3, from 2:55 to 3:20 is 25 minutes.
From 2:55 to 3:00 is 5 min, and 3:00 to 3:20 is 20 min, total 25 minutes.
2. Fix the sentence:
Grade 3 students says the duration from 4:10 to 4:45 are 35 minutes.
Corrected: Grade 3 students say the duration from 4:10 to 4:45 is 35 minutes.
Plural 'students' takes 'say' and singular 'duration' takes 'is' for 35 min.
3. Fix the sentence:
In Grade 3, 7:50 to 8:15 take 25 minute.
Corrected: In Grade 3, 7:50 to 8:15 takes 25 minutes.
From 7:50 to 8:00 is 10 min, 8:00 to 8:15 is 15 min, so 25 minutes total.
Part B: Fill in the Blank
Write the missing word or number on each line.
1. In Grade 3, from 1:40 to 2:05 on a number line is 25 minutes.
Five jumps of 5 minutes equals 25 minutes elapsed.
2. In Grade 3, from 9:25 to 10:00 is 35 minutes.
9:25 to 9:30 is 5, then 9:30 to 10:00 is 30, total 35 minutes.
3. In Grade 3, from 6:15 to 6:50 equals 35 minutes elapsed.
Same hour: 50 - 15 = 35, so the duration is 35 minutes.
4. In Grade 3, from 11:35 to 12:20 is 45 minutes.
11:35 to 12:00 is 25 min, plus 20 min to 12:20 gives 45 minutes.
Part C: True or False?
Read each statement. Circle True or False.
1. In Grade 3, from 3:05 to 3:40 is 35 minutes elapsed time.
True False
Both times share the 3 o'clock hour, so 40 - 5 = 35 minutes.
2. In Grade 3, from 8:50 to 9:10 is 30 minutes.
True False
8:50 to 9:00 is 10 min, plus 10 min more, totaling 20 minutes.
3. In Grade 3, a 5-minute interval number line helps find elapsed time.
True False
Number lines with 5-minute jumps let students count elapsed time easily.