Question
1
visibility
Determine the number that makes the equation true.
4 + 5 = 10 –

A
2

B
8

C
0

D
1
The correct answer is 1.
Solution:
Consider the given equation.
4 + 5 = 10 –
To determine the missing number, we need to find: 4 + 5.
Which gives:
4 + 5 = 9
So,
4 + 5 = 10 –
9 = 10 –
Next, we look for the number which when subtracted from 10 gives 9.
Note that,
10  1 = 9
Then,
4 + 5 = 10  1
So, number 1 makes the equation true.