## Tuesday, February 25, 2014

### P5/P6 Numbers (Systematic counting)

How many triangles are there?

## Thursday, February 13, 2014

### P6 Whole Numbers (Heuristics: Guess and Check, Algebra)

A courier company charged \$18 for every large parcel and
\$10 for every small parcel safely delivered.
However, it paid paid a penalty of \$20 for every lost or damaged parcel regardless of size.
If the company delivered 145 parcels (inclusive of safely-delivered or damaged ones)
and collected an amount of \$1030, how many of each type of parcels did it deliver safely?
(ie. how many Large, Small and Damaged parcels were delivered)
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WARNING: There are many, but finite number of, solutions to this problem.  Can you find them all? :)

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Here's my solution together with some insights into the problem. Check this out:

## Wednesday, February 12, 2014

### P6 Percentage (Fr CCL. Modified from Shaping Math worksheet)

In the beginning, there was a square.
Its length was decreased by 25% and its breadth was increased by 100 cm.
As a result the square had been transformed into a rectangle with the same area.
(a)What was the length of the initial square?

(b)What was its area?