To round 4.789 to the nearest whole number, examine the tenths digit, which is 7. Since 7 ≥ 5, round up by adding 1 to the whole number part, giving 5.

Round the numbers 12.34 and 4.789 to the nearest whole number and then find the difference.

Answer: 7

Step-by-step solution

Step 1: Round 12.34 to the nearest whole number

To round $12.34$ to the nearest whole number, look at the tenths digit, which is $3$ . Since $3 < 5$ , round down, leaving the whole number part as $12$ .

Step 2: Round 4.789 to the nearest whole number

To round $4.789$ to the nearest whole number, examine the tenths digit, which is $7$ . Since $7 \ge 5$ , round up by adding $1$ to the whole number part, giving $5$ .

Step 3: Find the difference between the rounded values

Subtract the smaller rounded number from the larger rounded number. Calculating $12 - 5$ yields $7$ .

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