1 / 6

Estimating with Whole Numbers

Estimating with Whole Numbers. Estimating with Whole Numbers. Definitions: Compatible Numbers – Are numbers that are close to the actual numbers in a math problem. Estimate - Is an answer that is close to the exact answer and is found by rounding.

amelia-hurley
Download Presentation

Estimating with Whole Numbers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Estimating with Whole Numbers

  2. Estimating with Whole Numbers Definitions: Compatible Numbers – Are numbers that are close to the actual numbers in a math problem. Estimate - Is an answer that is close to the exact answer and is found by rounding. Underestimate – An estimate that is less than the exact answer. Overestimate - A estimate that is greater than the exact answer.

  3. Estimating a Sum of Difference by Rounding Estimate the sum of difference by rounding to the indicated place value. Example 1: 5,439 + 7,516; thousands 5,439 5,000 + 7,516 + 8,000 13,000 The sum of 5,439 and 7,516 is approximately 13,000. Example 2: 62,167 – 47,511; ten-thousands 62,167 60,000 - 47,511 - 50,000 10,000 The difference of 62,167 and 47,511 is approximately 10,000. Strategy: 1.) Round each number to the indicated place value. 2.) Apply the indicated operation.

  4. Estimating a Sum of Difference by Rounding Estimate the sum of difference by rounding to the largest place value. Example 3: 611 + 378 611 600 + 378 + 400 1,000 The sum of 611 and 378 is approximately 1,000. Example 4: 45,709 – 11,250 45,709 50,000 - 11,250 - 10,000 40,000 The difference of 45,709 and 11,250 is approximately 40,000. Strategy: 1.) Round each number to the largest place value. 2.) Apply the indicated operation.

  5. Estimating a Sum of Difference by Rounding Try these: Estimate the sum of difference by rounding to the indicated place value. 1.) 11,245 + 12, 768, ten thousands 2.) 581 – 354, hundreds Try these: Estimate the sum of difference by rounding to the largest place value. 3.) 110,490 + 252,881 4.) 6,611 – 4,449

  6. Estimating with Whole Numbers Let’s try these: 1.) Ms. Escobar is planning a graduation celebration for the entire 8th grade. There are 9 eight-grade homeroom classes of 27 students. Estimate how many cups Ms. Escobar needs to buy for the students if they all attend the celebration. 2.) Mrs. Byrd will drive 120 miles to take Becca to the state fair. She can drive 65 miles per hour. About how long will the trip take?

More Related