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## Estimate Differences

#### Grade 4 Base Ten - 4.NBT.B.4

How to Estimate Differences - Estimating differences is just like estimating sums. Difference is when you subtract one number from the other. The steps of estimation are almost the same. For example, if it's a two-digit number then our aim to estimate to the nearest 10 meaning that there are two numbers. If it is a three-digit number, then you need to round it about or make an estimation to the nearest 100. The second step is to subtract the new numbers. But remember you are not getting the exact answer. Estimation can only bring you as close as possible to the actual answer but be the accurate figure. This process is often carried out when money is involved. For example, having enough money in the supermarket to get the groceries. For example, when you have \$40 and you want to buy groceries that are going to cost you around \$28. So, you round it about to the nearest tenth which is \$30. 58 --> 60 (Nearest tenth) 33 --> 30 (Nearest tenth) | 60 - 30 = 30. This 30 is your estimated answer and difference and not the actual answer. These worksheets and lessons are helpful when you are learning to get a ballpark idea of subtraction problems.

### Printable Worksheets And Lessons  #### Homework Sheets

I definitely recommend that you have students use the estimation arrows as a fixed technique.

• Homework 1 - If the ones place value is 4 or less, the tens place stays where it is.
• Homework 2 - If the ones place value is 5 or more, the tens place moves up one. The ones place is then changed to a 0.
• Homework 3 - To round numbers to the nearest tens place, we look at the ones place.

#### Practice Worksheets

I start rounding in my life when I retired. I take all of my change and deposit into my grandkids college fund. We're up to six hundred dollars now.

• Practice 1 - Estimate the difference between the integers.
• Practice 2 - When estimating numbers we always round to the highest place possible.
• Practice 3 - We follow these rules to determine the estimated values, when rounding to the nearest tens place.

#### Math Skill Quizzes

These are very rote driven difference based problems.

• Quiz 1 - See what you think about these.
• Quiz 2 - See what you know or don't know.
• Quiz 3 - All of these problems have the tens place as their highest value.