SPACE ACADEMY · TRY, THINK, PLAY

Class 5: Time travellers

Connect clock hands, calendars and elapsed-time clues at the selected challenge level.

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Try a quick challenge

Just a quick try. Not saved; no game rewards.

ExploreClocks and elapsed time

Mission control times three stages: Orbit climb 35 min, Launch prep 18 min, Jump transit 12 min. What is the total time for the mission?

Total: ?Orbit climb35 minLaunch prep18 minJump transit12 min
  1. 1 h 5 min
  2. 53 min
  3. 30 min
  4. 47 min
Need a hint?

Add every stage together; regroup 60 minutes as 1 hour if the total passes an hour.

Answer & method
Answer A: 1 h 5 min

35 + 18 + 12 = 65 min, which is 1 h 5 min.

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ReasonCalendars

This month's calendar is shown below, with every Saturday highlighted. What is the date of the fifth Saturday?

SunMonTueWedThuFriSat12345678910111213141516171819202122232425262728293031
  1. 2
  2. 9
  3. 23
  4. 30
Need a hint?

Scan down the highlighted column and count the highlighted dates in order.

Answer & method
Answer D: 30

The highlighted dates in order: 2, 9, 16, 23, 30; the fifth is 30.

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StretchCalendars

This month's calendar is shown below, with every Tuesday highlighted. How many Tuesdays does this month have?

SunMonTueWedThuFriSat1234567891011121314151617181920212223242526272829
  1. 4
  2. 3
  3. 5
  4. 6
Need a hint?

Count every highlighted date in the column.

Answer & method
Answer A: 4

Tuesday falls on days 3, 10, 17, 24, so there are 4.

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For grown-ups

Ideas to practise

  • Clocks and elapsed time. Separate hours and minutes. There are 60 minutes in one hour.
  • Calendars. Read the weekday headings. A week has seven days; count intervals, not both endpoints.

A game mission has 8 untimed questions. Only the game saves choices and hints. A finished mission earns one launch charge and participation towards the Deep-space array in Galaxy Command. The chapter goal is 8 different questions in finished sets; hints and wrong answers count as participation, not mastery. Some craft systems link more than one chapter.

Choose a level

Explore

Foundations: read a representation and practise the underlying idea.

  • Find elapsed time on a mission timeline
  • Reason with dates on a month calendar
  • Read and compare a departures timetable
  • Convert between 12-hour and 24-hour time
  • Find a duration or time across a.m. and p.m.
Play Explore

Reason

Paper-style reasoning: connect clues, interpret a diagram or work backwards.

  • Find elapsed time on a mission timeline
  • Correct a clock that runs fast or slow
  • Reason with dates on a month calendar
  • Read and compare a departures timetable
  • Convert between 12-hour and 24-hour time
  • Find a duration or time across a.m. and p.m.
Play Reason

Stretch

Higher-order practice: link conditions, test statements and avoid a tempting wrong method.

  • Correct a clock that runs fast or slow
  • Find elapsed time on a mission timeline
  • Reason with dates on a month calendar
  • Read and compare a departures timetable
  • Convert between 12-hour and 24-hour time
  • Find a duration or time across a.m. and p.m.
Play Stretch

Levels change representations, clues and conditions, not just the numbers. These are practice formats, not validated exam-equivalent difficulty.

Using the feedback

Learning reports distinguish hinted answers from independent first choices. They consider up to 20 recent different, unhinted questions per skill and level, and wait for at least five before suggesting extra practice. Repeating the same question does not add evidence. Reports are practice evidence, not IQ scores, diagnoses, ranks or predictions of competition results.

Ask the learner to explain a drawing or check with objects too. Choose Explore or an earlier chapter when a step feels too large.

Sources & limits

The grade topics use SOF IMO Class 5 published topic syllabus as their primary reference. The SOF sample and CREST previous-year paper below informed representations and reasoning demands. Providers have different topic boundaries; their syllabi are not interchangeable.

Questions, diagrams, picture choices, hints and explanations are original Otterly work, not copied paper questions or publisher artwork. No Olympiad provider is affiliated with or endorses Space Academy. This is not complete exam preparation; follow classroom teaching and check the current official syllabus too. Independent educator review is still needed for difficulty and breadth.

Content and coverage notes. To report a confusing question, describe the grade, chapter, level and question on the contact page. Do not send children’s personal information.

Private, local saves

Game progress stays only in this browser, in three anonymous explorer slots. Clearing site data or closing a private session may remove it. Download a private backup from Help & saves; there is no cloud sync. The game checks saves before play and stops on save failures rather than pretending progress was saved.

These page examples never change a saved game. Game links carry question settings, not a learner’s answers. There are no names, school details, public profiles, chat, analytics or advertising SDKs in the game. Grown-up guidance · Privacy

Original Otterly practice, not an official exam. Game progress stays on this browser.