Round to the Nearest 10
Round to the Nearest 100
Estimating Sums and Differences
Addition/Subtraction
Problem Solving
100

What is 29 to the nearest ten?

30

100

What is 789 rounded to the nearest hundred?  

800

100

What is the estimated sum of 476+ 382= ?

500 + 400 = 900

100

What is 539 + 273 = ?

539 + 273 = 812

100
The cafeteria served 284 cartons of chocolate milk and 372 cartons of white milk.  How many cartons of milk did the cafeteria serve?

284 + 372 = 656 cartons of milk 

200

What is 44 rounded to the nearest ten?

40

200

What is 301 rounded to the nearest hundred?

300

200

What is the estimated difference of 633 - 230 = ?

600 - 200 = 400

200

What is 234 - 125 = ?

234 - 125 = 109

200

My Christmas tree has 300 lights.  103 of them burned out.  How many are still lit?

300 - 103 = 197 lights

300

What is 378 rounded to the nearest ten?

380

300

What is 752 rounded to the nearest hundred?

800

300

What is the estimated difference of 845 - 402 = ?

800 - 400 = 400

300

What is 480 + 214 = ?

480 + 214 = 694

300

Third grade is going on a field trip.  On bus one there are 145 people.  On bus 2 there are 172 people.  How many people are on both buses?

145 + 172 = 317 people

400

What is 407 rounded to the nearest ten?

410

400

What is 224 rounded to the nearest hundred?

200

400

If Sara baked 302 chocolate chips and 492 sugar cookies for the bakery. ABOUT how many cookies did she bake in all

300 + 500 = 800 cookies 

400

What is 762 + 421 = ?

762 + 421 = 1,183

400

In garden there are 297 roses and 382 daffodils. How many flowers are in the garden altogether?

297 + 382 = 679 flowers

500

What is 998 rounded to the nearest ten?

1,000

500

What is 974 rounded to the nearest hundred?

1,000

500

Travis has 287 bottle caps saved for school.  If he takes 112 of them to school, ABOUT how many tabs does he have left to bring to school?

300 - 100 = 200

500

What is 982 - 286 = ?

982 - 286 = 696

500

I am taking a trip to Texas.  It is 672 miles away.  If I drove 278 miles yesterday, how many do I have left to drive?

672 - 278 = 394 miles