1998 MATH OLYMPIAD ANSWERS

Grade 5 Answers

Number sense

  1. 36
  2. 200
  3. 51
  4. 3 and 3/4 mi or 3.75 mi
  5. 5

Measurement

  1. 40
  2. area=112 sq in or in2, perim=74 in (2 points each, subtract 1 point each if units are not correct)
  3. 128
  4. 9 hours
  5. 62 sq m or 62 m2

Geometrical sense

  1. 165 degrees or 165o
  2. A and E
  3. 2/3 cm or .67 cm or .6 cm
  4. 165 degrees or 165o
  5. 64 sq cm or 64 cm2

Probability and statistics

  1. mean=56.7, median=58, mode=58, range=13 or (49 - 62) or (62 - 49) (1 point each)
  2. 7/18
  3. 1320
  4. 76
  5. 728,910

Algebraic sense

  1. 450
  2. 22 degrees or 22 o
  3. 151
  4. 54
  5. 16

Grade 6 Answers

Number sense

  1. 51
  2. at 1
  3. 3 and 3/4 mi or 3.75 mi
  4. 72
  5. 126

Measurement

  1. 50
  2. 128
  3. 4/3 or (1 and 1/3) or 1.3 (with bar over 3 to indicate repeating)
  4. 62 sq m or 62 m2
  5. 3 hours

Geometrical sense

  1. 165 degrees or 165o
  2. 48 cu ft or 48 ft3
  3. 5 cm
  4. 80 degrees or 80 o
  5. Any number between 10.73 and 10.75 inclusive and also 50 - 12.5pi sq in or in2

Probability and statistics

  1. 25/102 or 24.5% or .245
  2. 1320
  3. 190
  4. 728,910
  5. 32

Algebraic sense

  1. 16
  2. 600
  3. 344
  4. 4
  5. 25 or 25%