Grade 3 Math Puzzle 2: Bridge through a round number

A free grade 3 math puzzle that teaches Bridge through a round number. Try it first — the hint and the full solution open when you are ready.

Problem 2 · Bridge through a round number · 3 points

Made by AI and not reviewed by a real person.

A movie starts at 2:40 and lasts 50 minutes. At what time does it end?

3:20
3:50
3:40
4:30
3:30

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Use the next full hour as a stopping point instead of adding all 50 minutes at once.
The next full hour after 2:40 is 3:00. Find how many minutes it takes to get there, then subtract that from 50 minutes.

Show the answer and solution

Answer: E — 3:30

From 2:40 to 3:00 is 20 minutes, leaving 50 − 20 = 30 minutes. Another 30 minutes brings the time to 3:30. The wrong choice 3:50 comes from adding all 50 minutes after reaching 3:00, which counts the first 20 minutes twice.

Grade 3 puzzle 2: Bridge through a round number

Problem 2 · Bridge through a round number · 3 points