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A number line is marked at every whole number. How many unit steps must you take to travel from 148 to 163?

Class 6Whole NumbersWhole Numbers
  • A14
  • B16
  • C15
  • D311

Step-by-Step Solution

The number of unit steps is the difference: 163 - 148 = 15. Counting the marked points you touch (including 148) gives 16, which counts dots rather than steps, and 311 comes from adding the two numbers instead of subtracting.
Answer: C) 15

Key idea: From counting to whole numbers

Natural numbers (1, 2, 3, …) answer 'how many?' when there is at least one of something. But what if there are none? You need a number for that — and that number is zero. Adding 0 to the natural numbers gives the whole numbers: 0, 1, 2, 3, …. Every whole number sits at a fixed point on the number line, and they never run out — for any whole number you pick, there is always a larger one.

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