Copy of Estimating Sums and Differences - Numbers to 1,000

Open Ended

Why is it useful to estimate sums and differences by rounding numbers?

Multiple Choice

When rounding numbers to the nearest ten, what is the estimated sum of 34 and 75?

• 110

• 100

• 120

• 90

Multiple Choice

Which of the following is the correct estimate for 84 - 58 when rounding to the nearest ten?

• 20

• 30

• 40

• 10

Fill in the Blank

When estimating 29 + 62, round each number to the nearest ten: 29 rounds to ___ and 62 rounds to ___.

Multiple Choice

What is the main mathematical skill being practiced in these examples?

• Rounding numbers to the nearest ten before solving addition and subtraction problems

• Multiplying two-digit numbers

• Dividing numbers by ten

• Finding the average of numbers

Fill in the Blank

I estimated the ___ of these numbers. (Fill in the blank with the correct vocabulary word for an addition problem.)

Multiple Choice

What is the estimated sum of 374 and 445 when both numbers are rounded to the nearest hundred?

• 800

• 700

• 900

• 600

Open Ended

Explain why rounding numbers to the nearest hundred before adding or subtracting can make calculations easier.

Multiple Choice

After rounding 607 and 351 to the nearest hundred, what is the estimated difference?

• 300

• 200

• 400

• 500

Multiple Choice

Which of the following problems requires you to estimate the difference between two numbers?

• 374 + 445

• 467 - 226

• 404 + 283

• 559 + 175

Multiple Choice

After learning about estimating by rounding, do you feel more confident in solving problems with numbers up to 1,000?

• Yes, I feel much more confident now.

• I feel a little more confident, but still need practice.

• I feel the same as before.

• I am still confused and need more help.

Open Ended

What is one strategy you learned today for estimating sums and differences by rounding numbers?