WASHINGTON STATE MATHEMATICS COUNCIL

1999 MIDDLE SCHOOL MATH OLYMPIAD

ANSWERS

Subtract two points (or half credit) for missing or wrong units.

GRADE 5 ANSWERS

5

GRADE 6 ANSWERS

6

Number Sense

1. 40

2. 11

3. 17

4. $2

5. 17

Number Sense

1. 90

2. 11

3. 11

4. 156

5. 18

Measurement

1. 9

2. 62 sq cm or 62 cm2

3. 3:30 p.m. or 15:30

4. 16 sq cm or 16 cm2

5. 500

Measurement

1. 3:30 p.m. or 15:30

2. 9 sq cm or 9 cm2

3. $108

4. 2000

5. $3.20

Geometric sense

1. 122 degrees or 122o

2. 12 in. and 12 in. (or just 12 in.)

3. 5

4. 90 o and 63o

5. 372 sq ft or 372 ft2

Geometric sense

1. 300 degrees or 300o

2. 176

3. 1

4. 32 m

5. any number between 39.25 and 39.27 (inclusive) or 25 p /2 or (25/2)p or 12.5p sq. m (units are sq. m or m2)

Probability and statistics

1. 96

2. 1/6

3. 16/35

4. mean 86 (1 points)

mode 92 (1 point)

median 88 (1 point)

range 25 (1 point)

5. 380

Probability and statistics

1. 4/5

2. 96

3. 5

4. 144

5. 6.4% (Give 2 points for answer of .064)

 

Algebraic sense

1. 12

2. 25

3. 3/8

4. $28

5. 4 m

Algebraic sense

1. 50

2. a

3. 3/8

4. 9 or -9 (accept either or both answers)

5. 12 m