Page 238 - SK Year 5 Mathematics DLP

2 m

3 Dad wants to build a brick footpath 4 m
footpath in the house compound (B)
as shown in the diagram. He has grass grass
allocated RM4 000 for this. The
cost of building 1 m brick footpath
2
is RM100. Is there enough money?
footpath (A) 4 m

Solution 6 m

Identify the length Find the Calculate Conclude

and the breadth of total area the total cost whether the
footpaths A and B. of footpaths for the areas allocation of
Calculate the area of A and B. of footpaths RM4 000 is
footpaths A and B. A and B. enough.

Area of footpath A = 6 m × 4 m
= 24 m 2

Area of footpath B = 2 m × 4 m
= 8 m 2

Total area of footpaths A and B = Area of footpath A + Area of footpath B
= 24 m + 8 m
2
2
= 32 m 2

Total cost of the footpath = Total area of footpaths A and B
2
× The cost of 1 m brick footpath
= 32 × RM100
= RM3 200

Conclusion

Yes. No. The allocation of RM4 000 is enough not enough .

230 • Get each group of pupils to give their opinions on the method of calculation.
6.5.1 • Instil entrepreneurship and the value of making a budget before
making decisions.