Question
1
visibility
Determine the number that makes the equation true.
15 + = 25 – 9
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A
9
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B
1
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C
3
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D
4
The correct answer is 1.
Solution:
Consider the given equation.
15 + = 25 – 9
To determine the missing number, we need to find: 25 – 9.
Which gives:
25 - 9 = 16
So,
15 + = 25 – 9
15 + = 16
Next, we look for the number which when added to 15 gives 16.
Note that,
15 + 1 = 16
Then,
15 + 1 = 25 – 9
So, number 1 makes the equation true.