July 2011 - Page 10 of 11 - Math and Multimedia

Guest Post: Vedic Mathematics 3 – Multiplication with a series of 9’s

July 6, 2011 GB High School Mathematics

Sanjay Guilati (author) has been teaching computer and mathematics in Bhilai , state Chattisgarh in India for 15 years. Currently he is a teacher in a senior secondary school and he is also involved in teacher training. His online work can be found in Mathematics Academy.

***

Students often fear multiplication of numbers, which involve lot of 9’s in them. However the truth is exactly the opposite. The higher the number of 9’s in the question, the easier it is to calculate the correct answer.

There can be three cases with multiplication with series of 9’s

Multiplying a number with an equal number of 9’s
Multiplying a number with more number of 9’s
Multiplying a number with less number of 9’s

Here we are discussing Case 1 only and leaving the rest two cases for the readers to explore. » Read more

Leave a comment math strategies, math tricks, multiplication strategies, multiplication tricks, vedic mathematics, vedic mathematics strategies

Free Downloadable GeoGebra Tutorials in PDF

July 5, 2011 GB GeoGebra, Resources and Freebies

If you want to learn GeoGebra offline, here are the lists of excellent GeoGebra tutorials in portable document format (PDF). These materials are free and available for download.

I. GeoGebra Workshops from GeoGebra Institute of Ohio

WS 1: Intro, Installation & Drawings vs. Geometric Constructions
WS 2: Geometric Constructions & Use of Commands
WS 3: Algebraic Input, Functions & Export of Pictures to Clipboard
WS 4: Inserting Pictures into the Graphics Window
WS 5: Inserting Static and Dynamic Text
WS 6: Creating Dynamic Worksheets
WS 7: Custom Tools & Customizing the Toolbar
WS 8: Conditional Visibility & Sequences
WS 9: Spreadsheet View & Basic Statistics Concepts » Read more

10 comments geogebra pdf tutorials, geogebra pdf workbooks, geogebra pdf workshops, geogebra workshops

Order of Operations: 360 or 354?

July 4, 2011 GB High School Algebra, High School Mathematics

Last Saturday, I received Facebook message from a student asking help to simplify $[5(4)^3 + 6(11-4)] - 36 / 9 (2)$ . He got $354$ but his teacher’s answer was $360$ .

Although the problem above seems simple, a lot of students get confused by it, and in this case, even the teacher too. The expression above simplifies to » Read more

4 comments order of operation misconception, order of operations definition, order of operations lesson, order of operations problems, PEMDAS

« 1 … 8 9 10 11 »