---
title: "Time Units and Calendar Facts"
description: "Know the number of seconds in a minute and the number of days in each month, year, and leap year"
canonical: https://lightmysky.com/learn/mathematics/time-units-and-calendar-facts-mt_EXlmTURK_o
source: https://lightmysky.com/learn/mathematics/time-units-and-calendar-facts-mt_EXlmTURK_o.md
retrieved: 2026-10-19
---

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# Time Units and Calendar Facts

Know the number of seconds in a minute and the number of days in each month, year, and leap year

Subject: Mathematics · Area: Measurement · Ages 7 to 8
Page: https://lightmysky.com/learn/mathematics/time-units-and-calendar-facts-mt_EXlmTURK_o

## Ready when they can

- State that there are 60 seconds in a minute
- Name the months and state the number of days in each
- Explain that a leap year has 366 days and occurs every 4 years

## Lesson: Seconds, months, and leap years

You already know that 60 minutes make an hour. Time is built the same way in smaller pieces. Every minute has exactly 60 seconds. Count 'one-Mississippi, two-Mississippi' slowly, and each count is close to one second.

*(drawing: Watch the seconds tick from 0 all the way to 60. Then the minute is done and a new one starts.)*

**Example.** Mia checks her calendar. April has 30 days, but May has 31 days. February usually has only 28 days, the shortest month of all.

**Tip.** Here's a trick: 'Thirty days has September, April, June, and November. All the rest have thirty-one, except February alone.' That rhyme helps you remember which months are long and which are short.

*(drawing: Most years have 365 days. But every four years, February gets one extra day, making 366 days. That year is called a leap year.)*

**Recap.** Remember: 60 seconds make a minute, months have between 28 and 31 days, and every four years a leap year adds one extra day.

## Practice

17 questions on this page, each with its working shown.

## Needs first

- [Number of minutes in an hour](https://lightmysky.com/learn/mathematics/number-of-minutes-in-an-hour-mt_2XDGT5tei1)

## Opens up

- [Estimating and reading time](https://lightmysky.com/learn/mathematics/estimating-and-reading-time-mt_3XJkeIn6J6)
- [Comparing Time Durations](https://lightmysky.com/learn/mathematics/comparing-time-durations-mt_4emC463IyW)
- [Converting measurement units](https://lightmysky.com/learn/mathematics/converting-measurement-units-mt_d8al9JcajP)