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From any addition fact such as
1300 + 5200 = 6500
we can work out two subtraction facts.
Here we get
6500 - 1300 = 5200
and
6500 - 5200 = 1300
This is handy because we can use additions to check subtractions.
Example 1
Ahmed says that
| 2800 - 1100 = |
|
Use addition to check if he is right or wrong.
Answer
1700 + 1100 = 2800
So Ahmed is right.
Example 2
Bill says that
| 6500 - 3700 = |
|
Use addition to check if he is right or wrong.
Answer
3200 + 3700 = 6900 not 6500
So Bill is wrong.
