AC Lim's answer to Idk's Primary6 Math Singapore question.
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Date Posted:
3 years ago
For b), the general formula should be :
p × (2p - 1)
= 2p² - p
Total in pattern 15 :
2(15²) - 15
= 2(225) - 15
= 450 - 15
= 435
The +1 should be inside the square brackets
p × (2p - 1)
= 2p² - p
Total in pattern 15 :
2(15²) - 15
= 2(225) - 15
= 450 - 15
= 435
The +1 should be inside the square brackets
Alternative for a)
4 × (pattern number - 1) + 1
Eg.
Pattern 1 → 4 × 0 + 1 = 1
Pattern 2 → 4 × 1 + 1 = 5
Pattern 3 → 4 × 2 + 1 = 9
Pattern 4 → 4 × 3 + 1 = 13
4 × (pattern number - 1) + 1
Eg.
Pattern 1 → 4 × 0 + 1 = 1
Pattern 2 → 4 × 1 + 1 = 5
Pattern 3 → 4 × 2 + 1 = 9
Pattern 4 → 4 × 3 + 1 = 13
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