**Definition of Number Sense**

- Number Sense is the ability to recognize numbers, identify their relative values, and understand how to use them in a variety of ways, such as counting, measuring, or estimating.

**More about Number Sense**

- Number sense includes number meanings, number relationships, number size, and the relative effect of operations on numbers.

**Examples of Number Sense**

- The number sense strategy helps one to find the sum of 35 + 24 in this way: 30 + 20 = 50; 5 + 4 = 9; 50 + 9 = 59.
- The strategy to round 57 to the nearest ten is obtained by estimating whether 57 is closer to 50 or 60. As 57 is nearer to 60, the estimated value to the nearest ten of 57 is 60.

**Solved Example on Number Sense**

Arrange these decimal numbers in order from the least to the greatest.

0.34, 0.47, 0.21, 0.58

Choices:

A. 0.21 < 0.34="">< 0.47=""><>

B. 0.34 < 0.21=""> 0.47 <>

C. 0.58 > 0.47 > 0.34 > 0.21

D. 0.47 > 0.34 > 0.21 <>

Correct Answer: A

Solution:

Step 1:Use the number line

Step 2:The numbers are arranged in order from the least to the greatest in the number line.

Step 3:So, 0.21 < 0.34="">< 0.47=""><>

**Related Terms for Number Sense**

- Counting
- Decimal
- Estimate
- Measure
- Number Line
- Operation
- Place Value