This Week's Work : Week 31 - for Inquisitive Young Mathletes
Part I work :Review: 2010 AMC-8 # 25What about if John can only take 1 or 2 stairs at a time and now there are 10 stairs ? Make sure you know how to solve this as well. 2010 AMC-8 #23At least 2 ways :...
View ArticleThis Week's Work : Week 29 - for Inquisitive Young Mathletes
Part I work :Simon's favorite factoring tricks (for Sounak) :from my blogfrom AoPs videoAMC 10 and aboveSpeed, time and distance : Speed Part 2 from AoPsRate Part 2 from AoPsPractice finding the...
View ArticleClik here to view.
Unit digit, Tenth digit and Digit Sum
Word problems on unit digit, tenth digit or digit sum.#1: How many digits are there in the positive integers 1 to 99 inclusive? Solution I: From 1 to 9, there are 9 digits.From 10 to 99, there are 99...
View ArticleProblem Solving Strategies : Complementary Counting
Check out Mathcounts here, the best competition math program for middle school students. Download this year's Mathcounts handbook here.Video to watch on complementary counting from "Art of Problem...
View ArticleProblem Solving Strategies: Descending and Ascending numbers
Check out Mathcounts here, the best competition math program for middle school students. Download this year's Mathcounts handbook here.#1: 02-03 Mathcouts handbook question: A five-digit number is...
View ArticleA Skill for the 21st Century: Problem Solving by Richard Rusczyk
A Skill for the 21st Century: Problem Solving by Richard Rusczyk, founder of "Art of Problem Solving".Top 10 Skills We Wish Were Taught at School, But Usually Aren't from Lifehacker
View Article2014 AMC 8 Unofficial problems , Official answer key and Unofficial Solutions
Please roughly evaluate your score before checking what you got. A few among you have overly confident issue, especially my local students. Unofficial problemsOfficial Answer Key from MAA Unofficial...
View Article2013 AMC 10 A and B : Solutions to the Harder Problems
From AoPS videos : 2013 AMC 10 A2013 AMC 10 A #21 - This is also #17 on the AMC 12 A.2013 AMC 10 A #22 - This is also #18 on the AMC 12 A.2013 AMC 10 A #23 - This is also #19 on the AMC 12 A.2013 AMC...
View ArticleClik here to view.
The Grid Technique in Solving Harder Mathcounts Counting Problems : from Vinjai
The following notes are from Vinjai, a student I met online. He graciously shares and offers the tips here on how to tackle those harder Mathcounts counting problems. The point of the grid is to create...
View ArticleProblem Solving Strategies: Applications of the “Choose 2” method
1. Example: How many diagonals can be drawn for a polygon with “n” sides?Method I: The number of diagonals in a polygon = n(n-3)/2, where n is the number of polygon sides.For a convex n-sided polygon,...
View ArticleWeek Dec. 8th to Dec. 14th : Students' Logs
Everybody is welcome to try these questions. Better solutions will be posted here and credited to you, of course. Dec. 8th -- from Arnold I worked on the 2010 test.I had trouble with...
View ArticleClik here to view.
2012 Mathcounts School Round Harder Questions
Check out Mathcounts here, the best competition math program for middle school students. Download this year's Mathcounts handbook here. 2012 Mathcounts Sprint: #29: The difference of the squares of...
View ArticleClik here to view.
Sum of All the Possible Arrangements of Some Numbers
Check out Mathcounts, the best middle school competition math program up to the national level. Questions to ponder: (detailed solutions below)#1: Camy made a list of every possible distinct...
View ArticleFor Mainly High School Students : Quest for USAJMO or USAMO
AIME problems and solutions.AoPS High School Intermediate Topics Forum AMC-10/12 A, B and AIME Math Jam Transcripts from AoPS 2012 , 2013, 2014 AMC-10/12 A, B harder questions and 2012 AIME I all...
View ArticleAMC 10/12 A Countdown Clock -- Stay Focus -- > It's also Mathcounts chapter...
Ready for Mathcounts chapter , AMC 10/12 challenges ?The way to get better at ___ is through regular, deliberate practices (Show me the work !!), not just goal setting.Talk IS Cheap !!Now, stay...
View ArticleClik here to view.
2012 Harder Mathcounts State Target Questions
Check outMathcounts here -- the best competition math program for middle schoolers up to the state and national level. # 6: A semicircle and a circle are placed inside a square with sides of length 4...
View ArticleSome tricky counting/probability questions from Mathcounts/AMCs
Check out Mathcounts here, the best competition math program for middle school students. Download this year's Mathcounts handbook here.#9: 2007 Chapter Team Round: Using the digits 2, 3, 4, 7, and 8,...
View ArticleClik here to view.
2014 Mathcounts State Prep : Inscribed Cricle Radius and Similar Triangles
Question : \(\Delta\) ABC is an equilateral triangle. Circle "O" is the inscribed circle and it's radius is 15. What is the length of the radius of the smaller circle p which is tangent to circle "O"...
View Article2015 Mathcounts State/National Prep
Harder concepts from Mathcounts Mini : Also try the follow-up problems with detailed solutions. Don't do every question. Just the ones you think is hard. Geometry : #27 : Area and Volume #30: Similar...
View Article