Basically, it means to add the numbers in your head.
Neither; the sums are equal.
Knowing doubles facts can help you find other sums by providing a foundational understanding of addition that can be easily manipulated. For example, if you know that 4 + 4 = 8, you can quickly determine that 4 + 5 is just one more than 8, resulting in 9. This strategy allows you to build on known facts to calculate more complex sums efficiently. Additionally, recognizing patterns in doubles can aid in mental math and improve overall numerical fluency.
No.
Yes.
The answer will depend on what kind of sums.
use mental math
you can find them on the internet or in a book
Not all people will find the same sums hard. Also, when you are older you may well find that sums that look hard now are really quite easy.
Neither; the sums are equal.
No.
No.
Yes.
The answer will depend on what kind of sums.
2x4-3+5
There are 22 sums, if you don't include a number more than once. Where did you here a question like that?
all the sums are 0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,and 24
Biology- to find out about the human body. Chemistry- medicine Maths- Sums