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primary 6 | Maths
| Measurement
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Help pls
Date Posted: 5 years ago
Views: 273
Notice this pattern :
11+99=110
12+98=110
13+97=110
..
..
..
52+58=110
53+57=110
54+56=110
The numbers can be paired like this. They all end with a digit 0 in the ones place.
Because 0 + 0 = 0 , adding them together gives a bigger number which also has a digit 0 in the ones place.
You are left with number 55 which does not have a partner to be paired with. 55 has a digit 5 in the ones place.
Now 5 + 0 = 5
So when you add 55 to the bigger number(which has a 0 in the ones place), the ones digit will still be 5.
11+99=110
12+98=110
13+97=110
..
..
..
52+58=110
53+57=110
54+56=110
The numbers can be paired like this. They all end with a digit 0 in the ones place.
Because 0 + 0 = 0 , adding them together gives a bigger number which also has a digit 0 in the ones place.
You are left with number 55 which does not have a partner to be paired with. 55 has a digit 5 in the ones place.
Now 5 + 0 = 5
So when you add 55 to the bigger number(which has a 0 in the ones place), the ones digit will still be 5.
Thank u :)
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the 5 pens (that should have been commented on) are called Gopal, Herry, Carl, James and Sally
Date Posted:
5 years ago
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