Decimal Addition and Subtraction Estimation

To find a value that is close to the right answer

• subtraction

• sum

• rounding

• estimation

A reasonable guess that is close to the right answer.

• Estimation

• Rounding

• Compatible Numbers

• Whole Number

Mrs. Krutak used 1,820 pencils last year. This year she thinks she will use 1,932 pencils. About how many pencils is that all together?

• 2,000

• 3,000

• 4,000.

• 5,000

Kyle has two numbers 2.376 and 0.122.
What is the sum of both the numbers?

​ ​ ​ (a)  

What is the difference of both the numbers?

​ ​ (b)  

• 2.498

• 3.498

• 1.498

• 2.254

• 1.456

• 0.876

• 1.75

Chance has two numbers 2.376 and 0.122.
What is the sum of both the numbers?

​ ​ ​ (a)  

What is the difference of both the numbers?

​ ​ (b)  

• 2.498

• 3.498

• 1.498

• 2.254

• 1.456

• 0.876

• 1.75

Estimate the sum. What is a reasonable range for the answer to this problem?

9,542 + 1584

• 8,000 to 9,000

• 10,000 to 11,000

• 12000 to 14000

• 19,000 to 21,000

Estimate the answer to:

906 + 397

• 1300

• 1200

• 1310

• 1303