divide 30 by half and add 10
The correct answer and explanation is:
To divide 30 by half and then add 10, follow these steps:
- Divide 30 by half: When dividing a number by half, you are essentially multiplying it by 2. So, dividing 30 by 0.5 is equivalent to multiplying 30 by 2: 30÷0.5=30×2=6030 \div 0.5 = 30 \times 2 = 60
- Add 10: Now that you have 60 from the division, you add 10 to it: 60+10=7060 + 10 = 70
Thus, the final result is 70.
Explanation:
When the instruction is to divide a number by half, it can sometimes be a bit tricky, as it seems like you’re just splitting the number. However, dividing by a fraction like 0.5 (which represents “half”) is the same as multiplying by 2. So, 30 divided by 0.5 means you are doubling 30, which gives you 60. After that, simply adding 10 gives the final answer of 70.
This concept is useful when working with fractions and percentages. Dividing by a fraction often means multiplying by the reciprocal of that fraction. In this case, the reciprocal of 0.5 is 2, so multiplication is the easiest way to approach the division. This mathematical trick works for any number, and understanding how division by fractions works is a fundamental concept for many real-world calculations, from financial calculations to measurements in cooking or construction.