The blog postings are about the Singapore Math. The readers can learn from the postings on Solving Singapore Primary School Mathematics. You or your kids can learn dealing with Math modeling, Problem Sum from Lower Primary School to Upper Primary School level in Singapore school. This posting is a primary school math question on perimeter, fraction and decimal number.
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Read also the posting on Sarin learns Shapes and Solids in school (Math Concept) to know about shapes and the posting on Sarin and the million numbers to know about decimal number.
Read Also the posting on Sarin learns Concept of Fraction in school to learn about Fraction.
Upper primary school mathematics question UPQ155
The figure shows a circle of radius 56 cm. Find the perimeter of the shaded part of the figure? Give your answer correct to 1 decimal place. (π = 3.14159)
The shaded part is 3 parts of 8
r = 56cm
The perimeter of the circle = 2r × π
8 units = 2r × π
1 unit = 14 π
The perimeter is the outline of the shaded part of the figure
The perimeter of the shaded part of the figure = 3 × 14π + 56 + 56 = 243.9 cm