sept 6

• We'll start with two problems from homework:
• A family is crossing a dark narrow bridge; at most two of them can cross at a time, and the family has just one flashlight. Mom can run across in 1 minute, dad in 2 minutes; son in 5 minutes and their pet sea lion in 6 minutes. Can they all cross the bridge for 13 minutes?
• Cutting and reassembling
• Place a saucer on 5 tall wooden blocks. How many one can remove to keep the saucer stable?
• Graph the train movement (homework continued).
• Remind about remainders. Examples. How many apples can be divided equally between 2 and 3 people without remainder? 
• Experiments: Mirrors.

Homework

• What about that family on the bridge? still not done!
• Cut and reassemble in a square the Z pentamino from the past homework (august 30).
• One can draw various squares with corners on the nodes of the graph paper (two examples are shown below. Draw more squares (of different sizes, of course) - the more, the better!