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PSLE Mathematics

Question post on Wed, 20/06/2018 5:54pm

Hi All

This is q16 from 2017 PSLE paper. Anyone has the solution answers. Popular has sold out the answer key booklet. pls help part b (i) & (ii). Thank you.

Source: PSLE 2017

Answer

Khong Pek Mao · Answer 1 · Post on Thu, 21/06/2018 10:26am

This is a Area question.

1. A cuboid has 6 faces. Front, back. Left, right. Top bottom,

10 × 4 × 2 = 80 Front, back

5 × 4 × 2 = 40 left, right

10 × 5 × 2 = 100 top, bottom

80 + 40 + 100 = 220

2. For none painted, they must be inside the cuboid.

Length = 8, breadth = 3, height = 2

8 × 3 × 2 = 48

3. For outside faces,

Length = 10, breadth = 5, height = 4

Amendment

8 x 4 = 32 (4 lengths)

3 × 4 = 12 (4 breadth)

2 × 4 = 8 (4 heights )

32 + 12 + 8 = 52

valenzuela · Answer 2 · Post on Fri, 18/02/2022 3:24pm

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Ender · Answer 3 · Post on Thu, 21/06/2018 1:08pm

Sorry for more confusion, LOL

For b(i), I agree with Kong’s 48 cubes.

For b(ii), I agree with Swift’s 52 cubes.

Swift Formula · Answer 4 · Post on Wed, 20/06/2018 7:41pm

(10 + 5 + 10 + 5) x 4 + 10 x 5 x 2 = 220 cm^2 as (a)’s answer

(10 – 1) x (5 – 1) x (4 – 1) = 108 as (bi)’s answer
Edited : (10 – 2) x (5 -2) x (4 – 2) = 48 as (bi)’s answer
Thanks Ender for pointing out <3

(10 – 2) x 4 + (5 – 2) x 4 x (4 – 2) x 4 = 52 as (bii)’s answer