3rd Grade: Estimating Sums & Differences in Math Challenge

A bakery sold 245 cupcakes on Monday and 378 cupcakes on Tuesday. How many cupcakes did they sell in total? Estimate the sum first.

• 500

• 600

• 623

• 700

A library has 512 books. If 178 books are checked out, how many books are left in the library? Check if your answer is reasonable by estimating.

• 250

• 334

• 400

• 300

A toy store had 625 toys. They sold 289 toys during a sale. How many toys are left? Estimate the difference before calculating.

• 400

• 300

• 336

• 250

Emma has 432 stickers. She gave 145 stickers to her friend. How many stickers does Emma have now? Estimate the difference to check your answer.

• 250 stickers

• 300 stickers

• 287 stickers

• 287

A farmer harvested 345 apples and 267 oranges. How many fruits did he harvest altogether? Estimate the total before solving.

• 400

• 350

• 500

• 612

A school has 789 students. If 456 students are present today, how many students are absent? Estimate the difference to see if your answer makes sense.

• 400

• 250

• 333

• 500

A zoo has 215 animals. They received 128 more animals. How many animals are there now? Estimate the total before calculating the exact number.

• 343

• 300

• 215

• 400

Liam read 356 pages of a book. If he has 124 pages left to read, how many pages is the book in total? Check your work by estimating the total number of pages.

• 500

• 400

• 480

• 450

Tags

CCSS.2.NBT.B.7

CCSS.3.NBT.A.2

A concert had 478 attendees on the first day and 289 on the second day. How many attendees were there in total? Estimate the sum to verify your answer.

• 678

• 589

• 800

• 767

A store had 600 candies. They sold 275 candies. How many candies are left? Estimate the difference to check if your answer is reasonable.

• 325

• 400

• 350

• 275