Tag Archives: Singapore

Primary 6 SA1 Revision 1

P6-SA1-Ex 1

Ans:

1–  3

2–  2

Dis­tance –>  Time × Speed

25/60 × 60 = 25 km

 

3–  3

4–  3

Total age –>  2u + 7u = 9u

9/7

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Primary 5 April Review 3

P5-Apr-Review 3

Ans:

1–  3

2–  3

2  3/4  = 11/4

11/4  =  22/8

 

3–  2

6   :   8    =   3   :   4
=   9   : 12

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Primary 4 April Problem Sums 5

P4-PSP-Apr-Ex5

Ans:

1–  2822 peo­ple

243 × 4 = 972 men

972 + 243 = 1215 adults

1215 + 392 = 1607 children

1607 + 1215 = 2822 peo­ple

 

2–  131 coins

2389 + 2531 = 4920 ( total num­ber of coins)

Qn 2

4920 — 120 = 4800

4800 ÷ 2 = 2400 ( Num­ber of coins in Box B at the end)

2531 — 2400 = 131 coins

 

3–  $1368

One blouse –>  $19 × 3 = $57

$57 × 24 = $1368

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Primary 6 Circles Level 2 Ex 1

P6-Circles-L2-Ex1

Ans:

1–  12   4/7 m 

Diam­e­ter –>  2 × 2 m = 4 m

Cir­cum­fer­ence –>  22/7  × 4 m = 12   4/7 m 

 

2–   (2π + 8) cm

Diam­e­ter –> 2 × 4 cm = 8 cm

1/4 × π × 8 = 2π cm

2π cm + 4 cm + 4 cm = (2π + 8) cm

 

3–  77 cm²

2 quad­rants = 1 semi circle

1/2 × 22/7 × 7 × 7 = 77 cm²

 

4–   (18π + 12) cm

Perime­ter of big semi-circle –>  1/2 × π × 24
= 12π cm

Perime­ter of small semi-circle  –>  1/2 × π × 12 = 6π cm

Total perime­ter —>  12π cm + 6π cm + 12 cm = (18π + 12) cm

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Primary 5 April Problem Sums 2

P5-Apr-PSP-Ex 2

Ans:

1–  12 l

2–  $114

Qn 2

 

1u ->  $36 — $15 = $21

Stella (at first) –>  $21 + $36 = $57

$57 × 2 = $114

 

3–  8th day

1st and 2nd day ->  1/12 + 1/6 = 1/4 of his money

4/4 — 1/4 = 3/4 of his money left after the 2nd day.

3/4 ÷ 1/8 = 6 days

6 + 2 = 8 days

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Primary 6 April Problem Sums 4

P6-PSP-Apr-Ex 4

Ans:

1–  Richard  ->  $74  ,   Louis  -> $13

Total amount of money in the end– >  $87 + $17 = $104

Richard  :  Louis
7         : 1

8u  –>  $104
1u  –>  $13 (Louis)

$13 × 7 = $91

$91 — $17 = $74 (Richard)

 

2–  $94 146

4   1/2 years  ->  54 months

54 × $1299 = $70 146

$70 146 + 20 000 + 4000 =  $94 146

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Primary 5 April Review 2

P5-Apr-Review 2

Ans:

1–  3

2–  3

78/9  =  8  6/9  =  8  2/3 

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Primary 4 April Problem Sums 4

P4-PSP-Apr-Ex4

Ans:

1–  $50

Doc4

 

44 × 5 = $220

$292 — $220 = $72

$72 ÷ 12 = $6 (bulb)

$6 + $44 = $50

 

2–  76 316 more men

80 176 — 79 404 = 772 children

772 × 3 =  2316 women

79 404 — 2316 = 77 088 men

77 088 — 772 = 76 316 more men

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Primary 3 April Review 1

P3-Apr-Review 1

Ans:

1–  3

2–  3

8401 – 4773 = 3628
3628 + 288 = 3916

 

3–  3

4–  4

28 hun­dreds = 2800

2800 + 4105 = 6905

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Primary 6 Circles Level 1 Ex 1

P6-Circles-L1-Ex1

Ans:

1–  3

Perime­ter of 1 quad­rant ->  1/4 ×  π × diam­e­ter
=  1/4 × 22/7  × 14 cm
= 11 cm

11 cm + 11 cm + 7 cm + 7 cm + 7 cm = 43 cm 

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