Sprocket's Clock — 12-Hour & 24-Hour Time Conversion (Grade 2)

About this activity

A time appears written one way — 3:00 PM, or 20:00 — and the child taps the same time written the other way from three number choices. Sprocket the rooster cheers along in this interactive Grade 2 time activity about converting between 12-hour and 24-hour notation, all running in the browser with nothing to install and no sign-up.

The key idea is that after noon, 24-hour time keeps counting upward: 1:00 PM becomes 13:00, 3:00 PM becomes 15:00, and 8:00 PM becomes 20:00. The choices are built around the common slip-ups — forgetting to add the twelve, or adding it the wrong way — so a child has to actually do the conversion rather than guess. Working both directions, twelve-hour to twenty-four and back, makes the relationship between the two ways of writing time stick.

It builds on Common Core 2.MD.C.7 — telling time using a.m. and p.m. — extended to 24-hour notation for a fuller picture of how time is written. No timer, no score — just calm, playful practice.

What's inside this activity

• Designed for Grade 2 learners (ages about 7–8)
• Common Core strand: Measurement & Data
• Aligned to Common Core standard 2.MD.C.7

How to play

Read the time shown and notice which way it is written — 12-hour or 24-hour.

Work out the same time in the other notation, then tap the matching choice.

Not quite? Try again as many times as you like — there is no timer and no score.

What your child practices

• Converting an afternoon or evening time from 12-hour to 24-hour notation
• Converting a 24-hour time back to 12-hour with a.m. or p.m.
• Understanding that hours after noon keep counting up to 24
• Avoiding the common slip of forgetting, or wrongly adding, the twelve

Learning goals

Convert times between 12-hour and 24-hour notation in both directions.

Understand that after noon, 24-hour time continues counting past twelve.

Extend the a.m./p.m. work of Common Core 2.MD.C.7 to the way time is written on schedules and devices.