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Question
primary 5 | Maths
| Whole Numbers
2 Answers Below
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Hi i just want to ask why the method on the left does not work for the method on the right or am i doing things wrong?
Date Posted: 3 years ago
Views: 508
Left have 10 numbers while right have 35 numbers, you can not use 70×71÷2
On the right,
You can use
34×70÷2 then +70 = 1260
On the right,
You can use
34×70÷2 then +70 = 1260
Total number 70÷2 =35
Pair the number to sum
2+68=70
4+66=70
6+64=70
.
.
.
.
34+36=70
Then the last number 70
Get it?
Pair the number to sum
2+68=70
4+66=70
6+64=70
.
.
.
.
34+36=70
Then the last number 70
Get it?
I do nt understand
See 2 Answers
Refer to comments
done
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Hope this helps
Date Posted:
3 years ago
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