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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.
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| Solution | Name | Grade | School |
| 7x2-0!-0! | Kate Ahrens | 7 | Mount Olive Middle School |
| (2+0)x(7-0!) | Chua Cheng Aik | 9 | Hwa Chong Institution |
| 7x2-0!-0! | Neal Amos | 10 | Brookstone School |
| 7x2-0!-0! | Nick A | 6 | Parkermiddleschool |
| 2x7-(0!+0!) | Anton Baker | 6 | John-F-Kennedy School |
| 20-7-0! | Justen B | 6 | Parker Middle School |
| (7-0^0)x2 | Meghan B | 6 | Parker Middle School |
| 7*2-0!-0! | Bob Chen | 8 | Northwest Junior High |
| 7*2-0!-0! | Timothy Tay Kai Cheng | 8 | Hwa Chong Institution |
| (7-0^0)x2 | Calvin Sim Poh Chuan | 12 | Hwa Chong Institution |
| (0!+0!)x7-2 | David C | 6 | Parker Middle School |
| 2(0-0!+7)
20-0!-7 |
Khu Boon Tat Daren | 9 | Hwa Chong Institution |
| 7x2-((0!)+(0!)) | Noah Delius | 6 | John F. Kennedy School, Berlin, Germany |
| 7x2-0!-0! | Tran Ha Duong | 9 | 3h, Hwa Chong Institution |
| 7x2-0!-0! | Mae D | 6 | Parker Middle School |
| 2*7-0!-0! | Michael Endick | 8 | Foothill Middle School |
| 7x2-(0!+0!) | Sophie Farah | 8 | Hudson Montessori Middle School |
| 20-7-0! | Tim Freborg | 7 | Hudson Montessori |
| (7-0^0)x2 | Kam Mao Quan Gabriel | 7 | Hwa Chong Instituition |
| 20-7-(0!) | Chan Tuck Ging | 7 | Hwa Chong Institution |
| 2x7-0!-0! | Aly G. | 6 | Parker Middle Shcool |
| 20-0!-7 | Wu Zi Hao | 9 | Hwachong Institution |
| 2*(7 - (0^0)) | Nicholas Heng | 8 | Hwa Chong Institution |
| 7x2-0!-0! | Yeo Si Heng | 8 | Hwa Chong Instituition |
| 7*2-0!-0! | Emily Himles | 7 | Rohrer Ms |
| (20-7)-0! | Angelina Hintze | 6 | John F. Kennedy School |
| (2x7)-0!-0! | Cara Hudak | 8 | Hudson Montessori Middle Scholl |
| (7x2)-0!-0! | Matt H | 6 | Parker Middle School |
| 7*2-0!-0! | Lee Zi Jian | 8 | Hwa Chong Instituion |
| 7x2-0!-0! | Sim Zhi Jian | 8 | Hwa Chong Instiution |
| 20-7-0! | Lau Wei Jie Jonathan | 9 | Hwa Chong Institution |
| 20-7-0! | Ng Xu Jie | 8 | Hwa Chong Institution |
| (2+0!)!+7-0! | Song Cheng Jun | 7 | Hwa Chong Instituition |
| 20-7-0! | Tan Song Kai | 8 | Hwa Chong Institution |
| (2x7)- 0! - 0! | Olivia Kamensky | 8 | Brookstone School |
| 7x2-(0!)-(0!) | Szeto Kah Keong | 8 | Hwa Chong Institution |
| 7*2-0!-0! | Delwin Koh | 8 | Hwa Chong Institution |
| 20-7-0! | Gannon Lavins | 7 | Hudson Montessori School |
| (2!+0!)!-0!+7 | Benjamin Low | 8 | Hwa Chong Institution |
| 2*(7-0^0) | Amanda L. | 6 | Parker Middle School |
| 7*2-(0!+0!) | Kelley Mcintire | 9 | Brookstone |
| 7*2-0!-0! | Ella Medicus | 8 | Hudson Montessori School |
| 7x2-0!-0! | Connor M. | 6 | Parker |
| 7*2-0!-0! | Jessica M | 7 | Mount Olive Middle School |
| 7x2-0!-0! | Kelsey M | 6 | Parker Middle School |
| 2x7-0!-0! | Margaret M. | 6 | Parker Middle School |
| 20-7-0! | Natalie M. | 6 | Parker Middle School |
| 20-7-0! | Olivia M | 6 | Parker Middle School |
| 7+(2+0!)!-0! | Ng Jun Da Nelson | 8 | Hwa Chong Instituition |
| 2*7-0!-0! | Yuxiao Ning | 12 | Hoboken High School |
| (2x7)-0!-0! | Cam O | 6 | Parker Middle School |
| 2*7-0!-0! | Emily O | 6 | Parker Middle School |
| (7-0^0)x2 | Sio O | 6 | Parker Middle School |
| 7*2-0!-0! | Ryan Prince | 7 | Rohrer M.S. |
| (2*7)-0!-0! | Ow Zhen Quan | 8 | Hwa Chong Institution |
| 7x2-0!-0! | Tang Zhuo Hao Ray | 7 | Hwa Chong Institution |
| 2x7-0!-0! | Adam Roenberg | 7 | Hudson Montessori School |
| 7*2-0!-0! | Glenn Goh Rongjie | 9 | Hwa Chong Insituition |
| (7x2)-0!-0! | Benjamin Lin Ruiyang | 1 | Hwa Chong Institution |
| 7x2-0!-0! | Caylie Scherba | 8 | Hudson Montessori Middle School |
| 20 - 7 - 0! | Nayan Shah | 8 | Hudson Montessori School |
| 7*2-0!-0! | Selena Starbard | 7 | Rohrer M.S. |
| 20-0!-7 | Darren Toh | 9 | Hwa Chong Institution |
| 20- (7+0!) | Henry Trimpe | 1 | Hudson Montessori School |
| (7x2)-0!-0! | Scott Tully | 6 | Parker Middle School |
| 7x2-0!-0! | Elizabeth Wargo | 8 | Hudson Montessori School |
| (2+0!)!-0!+7 | Ang Chong Wei | 9 | Hwa Chong Institution |
| 20-0!-7
(7*2)-0!-0! |
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. |
| 20-7-0! | Steven Winklosky | 6 | Christ The Divine Techer School |
| 20-0!-7 | Jerrold Au Ying Xian | 9 | Hwa Chong Institution |
| ( 7 - 0^0 ) * 2 | Foo Ren Xiang | 3 | Hwa Chong Institution |
| -2+(0!+0!)*7 | Han Xiaoxiao | 9 | Hwa Chong Institution |
| 20-0!-7 | Lim Han Xin | 7 | Hci |
| -2+(0!+0!)x7 | Shaun Lum Yu Xuan | 3 | Hwa Chong Institution |
| (7x2)-0!-0! | Hshieh Chyi Yan | 7 | Hwa Chong Institution |
| 7*2-0!-0! | Chan Shen Yee | 4 | Hwa Chong Institution |
| (7x2)-(0!+0!) | Lee Jun Yi | 8 | Hwa Chong Institution |
| 20-0!-7 | Low Kah Yi | 9 | Hwa Chong Institution |
| 20-7-0! | Zhou Yifan | 3 | Hwa Chong Institution |
| (2!+0!)!-0!+7 | Zou Xiang Yu | 7 | Hwa Chong Institution |
| 7x2-(0!)-(0!) | Xiao Yuting | 8 | Hwa Chong Institution |
| 20-7-(0!) | Ng Soon Zhou | 7 | Hwa Chong Institution Highschool |
| (7-0!)*2+0 | Yu Zhou | 1 | Hwa Chong Institution |
| 20-7-0! | Chrissa | 6 | John F. Kennedy School |
| 20-0!-7 | NergüL | 10 | ÖZel Fatih Sultan Lisesi |
| 2(0-0!+7) | Yuanxi | 9 | Hwa Chong Institution |
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