Prof. S. Brick Math for Elem Ed I; Quiz 8 Math 201
Summer ’04 section 101
0. Print your name:
1. A student doing clock arithmetic turns in a problem that has been smudged. You make
out the clock equation 3 ×4 = 7 but you cannot tell how many hours are on the “clock”.
Explain how you know, nevertheless, that the student made a mistake.
2. Suppose 0 < d < b. Show how a model can be used to explain why 1
b<1
d
3. Suppose 0 < d < b. Prove that 1
b<2
(b+d).
