Rachunki pamięciowe na liczbach naturalnych - Matematyka Szkoła Podstawowa i Gimnazjum

In this video, I show how to perform mental calculations involving mental addition, mental subtraction, mental multiplication, and mental division, using the technique of breaking numbers into parts and the rule of ignoring zeros when multiplying and dividing. I teach how to use two main methods of doing calculations in your head: breaking down both numbers into tens, hundreds, and units, or breaking down only one of them. I also explain how to perform quick operations on large numbers with the help of multiplication and division tables. I demonstrate how to work with numbers ending in zeros and the principles of removing zeros in division. I discuss concepts such as addend, sum, minuend, subtrahend, difference, factor, product, dividend, divisor, and quotient, and show step by step how to carry out each operation so that they become easier to perform without paper, pen, or a calculator. TABLE OF CONTENTS: 1. Mental addition – method of breaking down both numbers 2. Mental addition – method of breaking down only the second number 3. Mental addition of three-digit numbers 4. Mental subtraction – breaking down the subtrahend 5. Mental subtraction of three-digit numbers 6. Mental multiplication – breaking down the larger factor 7. Mental multiplication of numbers ending in zeros 8. The importance of multiplication tables and the expansion method 9. Mental division – breaking down the dividend 10. Mental division using several components 11. Removing zeros in division 12. Relationship between multiplication tables and division tables CONTINUATION OF THIS VIDEO: [   • Dokończenie filmu p.t. Rachunki pamięciowe...  ](   • Dokończenie filmu p.t. Rachunki pamięciowe...  ) More content available in the playlist: [   • RACHUNKI PAMIĘCIOWE  ](   • RACHUNKI PAMIĘCIOWE  ) EASY ACCESS to all my math lessons is available through my website: [www.matmagwiazdy.pl](http://www.matmagwiazdy.pl) On this channel you will find the full course – 100% of the lessons – in Mathematics for Primary School, High School, and Technical School. Good luck :) Tomasz D. Gwiazda 00:00 Mental addition – method of breaking down both numbers 01:58 Mental addition – method of breaking down only the second number 03:40 Mental addition of three-digit numbers 06:58 Mental subtraction – breaking down the subtrahend 07:50 Mental subtraction of three-digit numbers 09:27 Mental multiplication – breaking down the larger factor 11:16 Mental multiplication of numbers ending in zeros 13:38 The importance of multiplication tables and the expansion method 16:23 Mental division – breaking down the dividend 17:09 Mental division using several components 18:51 Removing zeros in division 19:52 Relationship between multiplication tables and division tables