#### A Math Forum Project

Math Forum || Problems of the Week || Student Center

This Web page is intended to record solutions submitted by students in grades three through twelve. Student solutions were submitted January 1, 1999 through February 1,1999. Submissions for missing numbers can still be submitted using the Web form.

Rules: use the digits in the year 1999 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 71 to 80

 Solution Name Grade School 71 (9x9)-(1+9) Jinane Beaubrun 8 St.Jude School,Brooklyn, NY 71 9*9-1-9 Alyssha Duncan 6 Raymond Park Middle School 71 (9*9)-(9+1) Michael Falls 6 Raymond Park Middle School 71 (9*9)-9-1 Jeramey Franklin 6 Raymond Park Middle School 71 (-1 -9) +(9)(9) Lisa Gardner 3 Boyette Springs ES 71 (9 x 9) - 1 - 9 Lisa Jackson 4 Cheat Lake Elementary 71 (9*9)-1-9 Chris Waid 8 RFMS 71 -(1+9)+9*9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 71 9x9-9-1 Victoria 5 James River Elementary 71 9*9-9-1 Math Group 11 8 Ashford School 72 1x9x9-9 Jinane Beaubrun 8 St.Jude School, Brooklyn,NY 72 (9*9)-(9*1) Michael Falls 6 Raymond Park Middle School 72 (1)(- 9) +(9)(9) Lisa Gardner 3 Boyette Springs ES 72 (1+sqrt9!)x9+9 Michelle Goldwyn 8 Reading-Fleming Middle School 72 (9 x 1 x 9) - 9 Lisa Jackson 4 Cheat Lake Elementary 72 1*9*9-9 Kevin Sullens 8 Reading Fleming Middle School 72 (-1^9+9)*9 Chris Waid 8 RFMS 72 9x9-9^1 Victoria 5 James River Elementary 72 9*9*1-9 mathgroup10 8 Ashford School 72 9*9*1-9 Math Group 11 8 Ashford School 73 1-9+9*9 Jared Baker 8 Reading-Fleming middle school 73 (9x9)-(9-1) Jinane Beaubrun 8 St.Jude School, Brooklyn, NY 73 9x9-9+1 Tony Drake 6 Raymond Park Middle School 73 (9*9)-(9-1) Michael Falls 6 Raymond Park Middle School 73 9x9-9+1 Chelsea Flaum 10 Gulf Coast High School 73 (1- 9) +(9)(9) Lisa Gardner 3 Boyette Springs ES 73 9x9-9+1 Sara Gobble 6 Raymond Park Middle School 73 (9 x 9) - 9 + 1 Lisa Jackson 4 Cheat Lake Elementary 73 1+(9*9)-9 Chris Waid 8 RFMS 73 9x9-9+1 Victoria 5 James River Elementary 74 9x9-(sqrt9)!-1 Myrdiana Davilmar 7 St.Jude School, Brooklyn, NY 74 (9*9)-(sqrt9!+1) Michael Falls 6 Raymond Park Middle School 74 (-1 - (sqrt9)! )+(9)(9) Lisa Gardner 3 Boyette Springs ES 74 -1+(9*9)-sqrt9! Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 75 (1+(sqrt9))! x (sqrt9)+(sqrt9) Wendy Cheung 10 The Bishop Strachan School 75 (9x9)-(sqrt9)! x1 Myrdiana Davilmar 7 St.Jude School, Brooklyn, NY 75 (9*9)-(sqrt9! *1) Michael Falls 6 Raymond Park Middle School 75 (-1 +9)(9) +sqrt9 Lisa Gardner 3 Boyette Springs ES 75 1*(9*9)-sqrt9! Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 76 (9*9)-(sqrt9!-1) Michael Falls 6 Raymond Park Middle School 76 (1 - (sqrt9)!) + (9)(9) Lisa Gardner 3 Boyette Springs ES 76 9x9-(sqrt9)!+1 Daphne Ulysse 7 St.Jude School, Brooklyn, NY 76 1+(9*9)-sqrt9! Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 77 (9x9)-(sqr9+1) Sarah Bocik 6 Raymond Park Middle School 77 9x9-(1+sqrt9) Elizabeth Fahey 7 St.Jude School, Brooklyn, NY 77 (9*9)-(sqrt9+1) Michael Falls 6 Raymond Park Middle School 77 (-1 - sqrt9) + (9)(9) Lisa Gardner 3 Boyette Springs ES 77 ( 9x9 ) - sqrt 9 - 1 Jessica Hammond 4 Cheat Lake Elementary 77 (9 x 9) - (sqrt 9) - 1 Lisa Jackson 4 Cheat Lake Elementary 77 9x9-sqrt9-1 Daphne Ulysse 7 St.Jude School, Brooklyn, NY 77 -1+(9*9)-sqrt9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 78 (9x9)-sqrt9x1 Nikita Bacchus 7 St.Jude School, Brooklyn, Ny 78 (9*9)-(sqrt9*1) Michael Falls 6 Raymond Park Middle School 78 (-1 +9)(9) +(sqrt9)! Lisa Gardner 3 Boyette Springs ES 78 (9 x 9) - (sqrt 9) x 1 Lisa Jackson 4 Cheat Lake Elementary 78 9x9-sqrt9x1 Mireille Martineau 7 St. Jude School, Brooklyn, NY 78 1*(9*9)-sqrt9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 79 9x9-sqrt9+1 Elizabeth Fahey 7 St.Jude School, Brooklyn, NY 79 (9*9)-(sqrt9-1) Michael Falls 6 Raymond Park Middle School 79 (1 -sqrt9) +(9)(9) Lisa Gardner 3 Boyette Springs ES 79 (9 x 9) - (sqrt 9) + 1 Lisa Jackson 4 Cheat Lake Elementary 79 (1-sqrt9)+(9*9) Chris Waid 8 RFMS 79 -(-1+sqrt9)+9*9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 79 1+(9*9)-sqrt9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School 80 (1x(sqrt9+sqrt9)! )/9 Wendy Cheung 10 The Bishop Strachan School 80 (sqrt9*9)*sqrt9-1 Michael Falls 6 Raymond Park Middle School 80 (-1^9) +(9)(9) Lisa Gardner 3 Boyette Springs ES 80 sqrt9xsqrt9x9-1 Theresa Mirarchi 7 St.Jude School, Brooklyn, NY 80 9x9-1^9 Victoria 5 James River Elementary 80 -1+sqrt9*9*sqrt9 Jessica Erwin/Crystal Muguerza 7 T.A. Howard Middle School

Please notify Judy Ann Brown of any errors.

The Math Forum ** Judy Ann Brown ** 22 December 1998