Practise mathematics online - the new site of Mathefritz

How to tell the time - calculating with times, page 14 - 15

# Calculating with times - adding times

## Calculating with times Exercise (1) - Add 15, 30, 45 and 60 minutes to the time

Add the time indicated. What time is it now?

Draw the new time on the dials in your workbook and write the correct time in the boxes!

Time Exercises from page 14 in the exercise book

We add times: a quarter of an hour, half an hour or three quarters of an hour. ### + 30 minutes = ### + 15 minutes = ### + 45 minutes = ## Calculating with times - Add more minutes to the time

The exercises from page 15 in the exercise book.

Calculating with the time: We add minutes to the time. ### + 10 minutes = ### + 20 minutes = ### + 40 minutes = ## Tips for calculating with times: How to calculate with times

How to calculate correctly with times. We have compiled a few tips and aids so that you can better calculate with times.

One hour has 60 minutes. Therefore, your conversion factor for times is 60 and not as in the decimal system of our numbers the 10s like 10, 100, 1000.

If we get more than 60 minutes in a calculation, we have to subtract 60 minutes and add a whole hour for it.

80 minutes are 80 - 60 = 20 minutes plus one whole hour. Thus 80 minutes are exactly 1 hour and 20 minutes!

Always calculate the minutes to the next full hour. Then the hours up to the next full hour and then the further minutes to the minutes.

Example:

from 10:30 am to 3:45 pm are:

• 30 minutes until 11:00
• from 11:00 to 15:00 there are 4 whole hours
• from 15:00 to 15:45 is 45 minutes.
• So in total it is 4 hours and 75 minutes. The 75 minutes are converted to 1 hour (60 minutes) and 15 minutes.

## How to calculate with clock times - the exercises in our exercise book!

Uhrzeit lernThe successful booklet now with online maths exercises

#### Maths lesson 2 - Exercise book, We count up to 100

• Exercise book for the 2nd grade in elementary school
• Scope: 60 pages, DIN A 4, hardcover, b/w
• Published: 2017
• ISBN: 978-3941868267
• Price: 6,95 € Available now in every bookstore (can be ordered) or at Amazon.de.