Which ages is this activity for?

It is designed for Grade 2 (Measurement & Data) and works well for whole-class, small-group, or independent practice.

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

A free interactive Grade 2 time activity: convert times between 12-hour (a.m./p.m.) and 24-hour notation. Children read a time in one way of writing it and tap the same time in the other — learning that after noon, 24-hour time keeps counting (3:00 PM is 15:00). Sprocket the rooster cheers them on. Builds on Common Core 2.MD.C.7 (telling time using a.m. and p.m.), extended to 24-hour time.

Grade 2·Measurement & Data·2.MD.C.7

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 free, 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.

Frequently asked questions

What does the Sprocket's Clock — 12-Hour & 24-Hour Time Conversion (Grade 2) activity teach?: Sprocket's Clock — 12-Hour & 24-Hour Time Conversion (Grade 2) is a free interactive activity for Grade 2, focused on Measurement & Data. Children play it right in the browser — no printing, login, or setup required.
Is Sprocket's Clock — 12-Hour & 24-Hour Time Conversion (Grade 2) free to use?: Yes. Sprocket's Clock — 12-Hour & 24-Hour Time Conversion (Grade 2) is completely free, with no signup and no paywall, on any tablet, laptop, or classroom whiteboard.
Which ages is this activity for?: It is designed for Grade 2 (Measurement & Data) and works well for whole-class, small-group, or independent practice.

Practice this standard

See all 2.MD.C.7 activities