**Elementary School Number Sense Lesson 8: Number Line**

Today's concept will wrap up our "once-through" of covering the most common concept from each sequence level (#1-10, #11-20, #21-30, etc.) on an elementary school number sense test. This concept has appeared

**5 times**so far this year, with a median placement at

**question # 75**.

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Mastering these problems requires working with subtraction and negative numbers. They are pretty straightforward, but it is easy to overthink them. The questions read something like this:

**"What is the distance between A and B on the number line?"**

*Remember that*

**B - A**is the same as**B + (-A)**.**Example 1: On a number line, the distance between -4 and 34 is ___**

- Subtract A from B; A =
**-4**and B =**34** - 34 - (-4) = 34 + 4 =
**38**

**Example 2: On a number line, the distance between -22 and 71 is ___**

- Subtract A (
**-22**) from B (**71**) - 71 - (-22) = 71 + 22 =
**93**

**Example 3: What is the distance between negative fifteen and positive sixteen on the number line? ___**

- Subtract A (
**-15**) from B (**16**) - 16 - (-15) = 16 + 15 =
**31**

**Example 4: What is the distance between negative seven and negative two on the number line? ___**

- Subtract A (
**-7**) from B (**-2**) - -2 - (-7) = -2 + 7 =
**5**

**Example 5: The distance between -6.3 and 9.7 on a number line is ___**

- Subtract A (
**-6.3**) from B (**9.7**) - 9.7 - (-6.3) = 9.7 + 6.3 =
**16**

**Up Next for Elementary School: MultWhole3Num**