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primary 5 | Maths
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Date Posted: 6 years ago
Views: 412
A) 33
Each layer +2 so
1+2=3
99/3=33
Each layer +2 so
1+2=3
99/3=33
Thankz
a) 1+3+5...+99 = 100 seqs
- Because 1,3,5,7,9... are odd numbers, (100seqs ÷ 2) = 50 seqs
- PAIR the ends , (50seqs ÷ 2) = 25 seqs
[(1+99),(3+97),(5+95)].....
so each will total up too 100
*** 25seqs ×100 =2500 cans
b)
- using the same logic of the total of 100
10000cans ÷ 100 = 100 layers
100 layers × 8cm = 800cm or 8m
- Because 1,3,5,7,9... are odd numbers, (100seqs ÷ 2) = 50 seqs
- PAIR the ends , (50seqs ÷ 2) = 25 seqs
[(1+99),(3+97),(5+95)].....
so each will total up too 100
*** 25seqs ×100 =2500 cans
b)
- using the same logic of the total of 100
10000cans ÷ 100 = 100 layers
100 layers × 8cm = 800cm or 8m
See 1 Answer
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Date Posted:
6 years ago
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