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primary 5 | Maths | Whole Numbers
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Leai
Leai

primary 5 chevron_right Maths chevron_right Whole Numbers chevron_right Singapore

Pls explain c

Date Posted: 4 weeks ago
Views: 21
J
J
4 weeks ago
Notice that :

① Figure number and the number of white rectangles in the figure are always the same.

②Number of dark rectangles is always twice of the number of white rectangles in each figure.

③Number of stars is always one more than number of dark rectangles in each figure.

So if you let number of white rectangles be 1 unit,

Then ,
dark rectangles = 2 units
Stars = 2 units + 1

Total = 1 unit + 2 units + 2 units + 1
= 5 units + 1



5 units + 1 = 621
5 units = 620

1 unit = 124

So the figure number is 124 since 1 unit is the number of white rectangles
Cheyenne Liu
Cheyenne Liu
4 weeks ago
Do hire me as your maths tutor!

See 1 Answer

Part a:

Number of rectangles = 3 x 59 = 186
Number of stars = 58 x 2 + 3 = 119
Total shapes = 119 + 186 = 305

Part b:

429/3 = 143

Part c:

Total number of shapes = Rectangles + Stars = (3+3) + (3+2) = 3+3+5n
n = number of sequence
621-3-3=615
615/5 = 123
n = 123 (Ans)
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Cheyenne Liu
Cheyenne Liu's answer
6 answers (Tutor Details)
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J
J
4 weeks ago
3 x 59 = 177, not 186.

The total number of shapes = 5n + 1 , not 5n + 6