Estimating Sums & Differences: Fun 3-Digit Math Quest

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

• 700

• 500

• 623

• 600

A library has 512 books. If 129 books are checked out, how many books are left in the library? Use a number line to help you find the difference.

• 400

• 383

• 450

• 350

A toy store had 654 toys. They sold 287 toys during a sale. How many toys are left? Estimate the difference before calculating.

• 400

• 367

• 500

• 300

Emma has 432 stickers. She gave 145 stickers to her friend. How many stickers does Emma have now? Use a number line to find the answer.

• 250 stickers

• 287

• 300 stickers

• 287 stickers

A farmer harvested 325 apples and 478 oranges. How many fruits did he harvest altogether? Estimate the total before adding.

• 600

• 850

• 803

• 700

A school has 789 students. If 256 students went on a field trip, how many students are still at school? Use a number line to calculate the difference.

• 533

• 600

• 450

• 512

Liam collected 543 marbles. He lost 198 marbles while playing. How many marbles does he have left? Estimate the difference first.

• 345

• 400 marbles

• 500 marbles

• 345 marbles

A zoo has 612 visitors on Saturday and 489 visitors on Sunday. How many visitors did the zoo have over the weekend? Estimate the total first.

• 1000

• 950

• 1200

• 1101

A bookstore had 450 books. They received a shipment of 275 new books. How many books do they have now? Use a number line to help with the addition.

• 800

• 500

• 725

• 625

Sophie read 367 pages of a book. If she has 128 pages left to read, how many pages is the book in total? Estimate the total number of pages first.

• 480

• 510

• 495

• 450