Addition Exercises
Start by getting familiar with the combinations
of numbers that add up to 10
|
1 |
+ |
9 |
= |
10 |
|
2 |
+ |
8 |
= |
10 |
|
3 |
+ |
7 |
= |
10 |
|
4 |
+ |
6 |
= |
10 |
|
5 |
+ |
5 |
= |
10 |
Remember these and don’t forget they are
the same the other way around ;
6 + 4 and
7 + 3 still (equal) = 10
When you feel you know these equations, see if
you can work out what other single digit numbers that add up to.
Example
|
4 |
+ |
5 |
= |
9 |
|
7 |
+ |
5 |
= |
12 |
|
8 |
+ |
5 |
= |
13 |
When you know what numbers add up to 10 you can work
larger equations out like this,
8 + 5 = ?
(8 + 2 = 10) from
here 5 - 2 = 3
Then , 10 + 3 = 13
When you add larger numbers you often have to
work out the answer in calculation form, called a mathematical algorithm.
|
