The sum of 43.9 and a number is 49.65, as shown below. what number should go in the box to complete the addition problem? 43.9 plus box.75 equals 49.65

5

Step-by-step explanation:

The sum of 43.9 and a number is 49.65

First make equation using given phrase

Let number be x

"sum of 43.9 and a number" ⇒ 43.9 + x

43.9 + x  is 49.65

Therefore, 43.9 + x = 49.65

Now solve for x

43.9 + x = 49.65     [ subtract 43.9 both sides ]

          x = 49.65 - 43.9

          x = 5.75

Expression:  

43.9 + ?.75 = 49.65

          ↓

43.9 + 5.75 = 49.65

So, ? = 5

Hence, 5 will go in the box

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step-by-step explanation:

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