Math Forum || K-12 Math Puzzles || Problems of the Week || Student Center

 This Web page is intended to record solutions submitted by students in grades three through twelve. Submissions will be posted starting February 1, 2007. Rules: use the digits in the year 2007 and the operations of +, -, x, ÷, sqrt (square root), ^ (raise to a power), and ! (factorial), along with grouping symbols, to write expressions for the counting numbers 1 through 100. Please read and follow the rules carefully. Teachers may print out worksheets for students to record their findings, or print sheets of manipulatives for students to use.

## STUDENT SOLUTIONS: 20

 Solution Name Grade School 20+0x7 Chua Cheng Aik 9 Hwa Chong Institution 20+(0x7) Neal Amos 10 Brookstone School 20-(7x0) Max Yoong Pao Aun 7 Hwa Chong Institution 7*(2+0!)-0! Matthew Butrica 7 Rohrer Middle School 20-7*0 Bob Chen 8 Northwest Junior High 20+(0*7) Timothy Tay Kai Cheng 8 Hwa Chong Institution 7*0+20 20+0^7 Calvin Sim Poh Chuan 12 Hwa Chong Institution 7x(2+0!)-0! Amy C 6 Parker Middle School 7x0+20 Billy C. 6 Parker Middle School 20+(0x7) Khu Boon Tat Daren 9 Hwa Chong Institution 20+0^7 Tran Ha Duong 9 3h, Hwa Chong Institution (7x0)+20 Erica D 6 Parker Middle School (0!+2)*7-0! Michael Endick 8 Foothill Middle School (7*0)+20 Timothy Esposito 7 Rohrer Middle School 7(2+0!)-0! Sophie Farah 8 Hudson Montessori Middle School 20+0x7 Tim Freborg 7 Hudson Montessori 7+0+20 Sam F 6 Parker Middle School 20+(0x7) Kam Mao Quan Gabriel 7 Hwa Chong Instituition 20-7x0 Chan Tuck Ging 7 Hwa Chong Institution 20+(0*7) Molly Grasmick 7 Rohrer Ms 20+(7x0) Maggie G. 6 Parker Middle School 20+0*7 Wu Zi Hao 9 Hwachong Institution 20-7(0) Nicholas Heng 8 Hwa Chong Institution 20x7^0 Cara Hudak 8 Hudson Montessori Middle Scholl 20+0x7 Lim Aik Hwee 9 Hwa Chong Institution (High School Section) 20+(0x7) Matt H 6 Parker Middle School 0*7+20 Anthony Illiano 7 Rohrer M.S. 20+(7*0) Karen Israel 7 Roher Ms 20-(7*0) Lee Zi Jian 8 Hwa Chong Instituion 20+(0x7) Sim Zhi Jian 8 Hwa Chong Instiution 20+0(7) Chow Zheng Jie 9 Hwa Chong Institution 20+(0*7) Ng Xu Jie 8 Hwa Chong Institution 7*(2+0!)-0! Lau Wei Jie Jonathan 9 Hwa Chong Institution 20*7^0 Tan Song Kai 8 Hwa Chong Institution 20+(0*7) Tim Kenna 7 Rohrer Middle School 20-(0x7) Szeto Kah Keong 8 Hwa Chong Institution 20+(0*7) Delwin Koh 8 Hwa Chong Institution 20-0^7 Gannon Lavins 7 Hudson Montessori School 20+0*7 Benjamin Low 8 Hwa Chong Institution 20+(7x0) Luke Mansour 9 Brookstone School 20+(0x7) William Mathews 6 John F. Kenedy School 20+(7*0) Kelley Mcintire 9 Brookstone 7*(2+0!)-0! Ella Medicus 8 Hudson Montessori School 20+0^7 Nina Mielcarz 7 Rohrer Middle School 20-(7x0) Connor M. 6 Parker 7(2+0!)-0! Jessica M 7 Mount Olive Middle School 7x0+20 Margaret M. 6 Parker Middle School 20+7x0 Natalie M. 6 Parker Middle School 20+7*0 Yuxiao Ning 12 Hoboken High School 7*(0!+2)-0! Zack O'connell 7 Rohrer Ms 7x(2+0!)-0! Cam O 6 Parker Middle School 20+(7x0) Jesse P 6 Parker Middle School 7*(2+0!)-0! Ow Zhen Quan 8 Hwa Chong Institution 20+(0x7) Tang Zhuo Hao Ray 7 Hwa Chong Institution (20)+(7x0) Adam Roenberg 7 Hudson Montessori School 7*(2+0!)-0! Glenn Goh Rongjie 9 Hwa Chong Insituition (7x(0!+2))-0! Benjamin Lin Ruiyang 1 Hwa Chong Institution 20+(0x7) Caylie Scherba 8 Hudson Montessori Middle School (20)+(7*0) Kassidy Schmidt 1 Rohrer Ms 20-(7x0) Nayan Shah 8 Hudson Montessori School 7x0+20 Bobby S 6 Parker Middle School 20 + (0x7) Henry Trimpe 1 Hudson Montessori School 20+0x7 Darren Toh 9 Hwa Chong Institution 20+0x7 Ang Chong Wei 9 Hwa Chong Institution 20+(0*7) Chong Zhi Wei 7 Hwa Chong Insitution 7*(2+0!)-0! Tan Yi Wei 7 Hwa Chong Institution [7*(2+0!)]-0! Andrew Weindel 7 Rorer M.S. 20+(0x7) Lim Han Xin 7 Hci 20+(0x7) Shaun Lum Yu Xuan 3 Hwa Chong Institution 20+(0x7) Hshieh Chyi Yan 7 Hwa Chong Institution 20+0*7 Chan Shen Yee 4 Hwa Chong Institution 20x7^0 Lee Jun Yi 8 Hwa Chong Institution 20+0*7 Low Kah Yi 9 Hwa Chong Institution 20+0x7 Zhou Yifan 3 Hwa Chong Institution 20+(0x7) Zou Xiang Yu 7 Hwa Chong Institution [2+(0!)]*7-(0!) Xiao Yuting 8 Hwa Chong Institution 20+(0*7) Ng Soon Zhou 7 Hwa Chong Institution Highschool 20+0*7 Yu Zhou 1 Hwa Chong Institution 0x7+20 Chrissa 6 John F. Kennedy School 20+0^7 Jared 6 Parker Middle School 20-0*7 NergüL 10 ÖZel Fatih Sultan Lisesi 20+0x7 Yuanxi 9 Hwa Chong Institution

Please notify Judy Ann Brown of any errors.