# (Observed lesson - outstanding graded – maths investigation)

```(Observed lesson - outstanding graded – maths investigation)
Teacher: Chris de Cordova
Date: 25th January 2008
Lesson: Maths
Support: None
Learning Objectives
to calculate fractions of quantities (starter)
Tabulate systematically the information in a problem or puzzle. (main lesson)
to think logically and work methodically to solve problems and puzzles (main lesson)
Shared Learning
(Context: Recording for investigations earlier in the year was not very good and this is the third lesson in a
sequence working on improving recording and enquiry techniques. Only one of the HA boys has so far
shown much ability to crack these sort of problems without help)
Starter:
Fractions of quantities - 2 sets of five on board to do on whiteboards (MA of money + LA of whole numbers)
(HA How many different fractions can you find that have 8 as the answer?)
Main teaching:
Children gather at IWB to solve puzzle - crossing river question (girl with chicken, fox and bag of grain)
http://www.kidspsych.org/farm.html
Children can try similar problem on computers - suite available 9:50 - 10:20am)
3 people but weight has to be considered.
http://pbskids.org/cyberchase/games/modeling/index.html
Return children to classroom and ask children to explain what they did. Return to first one and record
moves.
Systematic recording often needed for problem solving.
Differentiated independent activities:
Various problems based on the river crossings idea - see group task sheets
Children can have counters, squared paper, cut out figures from the puzzles
(Jack M (very HA) finishes work quickly. He is in the middle of a challenge on the classic leapfrog puzzle,
working on 4 and 5 frogs a side to find a system and could continue with that if he finishes)
Plenary