Third Grade Math

2. Number Sense: Addition and Subtraction

Jordan had $1,237. He bought a new racing bike that cost $1,158. Estimate how much money he had left

after making his purchase.Explain how you found your answer.

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There are 255,483 people living in Orlando, Florida.What is 255,483 rounded to the nearest hundred?

a. 255,500b. 256,000c. 256,500d. 260,000

William collects bottle caps as a hobby.Last year he collected 234 bottle caps and this year he

has collected 52 more.To find 234 + 52, William added 234 + 50 = 284

What does he need to do next to find the sum?

a. Subtract 2 from 284b. Add 4 to 284c. Add 2 to 284

d. Subtract 2 from 234

Alyssa is counting the equipment in the P.E. Department.She counts 15 playground balls, 8 basketballs, some

tennis balls and 12 soccer balls.What other information is needed to find how many

tennis balls Alyssa counted?

a. How many balls she counted all togetherb. How many tennis rackets the school hasc. How many times the students have P.E.

d. How many footballs the P.E. department has

The Bird Factory had 185 birds on sale last Friday. It was a very busy weekend and 63 birds were sold by

Sunday night. How many birds had NOT been sold?( Use mental math to solve.)

a. 248b. 122c. 148d. 22

The Zoo has 359 types of snakes and 581 types of birds.Which number sentence shows the best estimate of how many

more kinds of birds than snakes are at the zoo?

a. 500 – 300 = 200b. 580 – 350 = 230c. 600 – 400 = 200

d. 580 – 360 = 220

The Mississippi River is 2,340 miles long. What is 2,340 rounded to the nearest thousand?

a. 2,000 b. 2,300 c. 2,400 d. 3,000

Kara read a book on her Kindle for 194 minutes on Friday and 85 minutes on Saturday.

Kara made a TEN as shown below. What is the missing number?194 + 85 = 190 + ____ = 279

a. 85b. 4c. 89d. 80

Lauren loves to read. She read a 231 page book last night before going to bed. Her little sister read a 78 page book before going to sleep. Which is the best estimate of the

total number of pages they read?

a. 330b. 320c. 310d. 300

To subtract 26 from 348 using mental math, Madison first subtracted 348 – 20 = 328.What should she do next?

a. Subtract 348 – 6b. Subtract 328 – 6

c. Add 328 + 6d. Add 348 + 6

Emmaly collects glass animals. So far, she has collected 216 glass penguins and 493 glass horses.

Which number sentence gives the best estimate of the number of glass animals Emmaly has collected?

(Use compatible numbers)a. 210 + 490 = 700b. 220 + 500 = 720c. 210 + 500 = 710d. 220 + 490 = 710

Conrad went on a road trip. He drove 438 miles on Friday and 285 miles on Saturday. Which is the most reasonable answer for how much farther he drove on Friday than on

Saturday?

a. 50 milesb. 100 milesc. 250 milesd. 150 miles

Amanda had $2,681. She bought a new canoe that cost $1,789. Estimate how much money she had left.

Explain how you found your answer.

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There are 507,531 people living in Volusia County, Florida.What is 507,531 rounded to the nearest thousand?

a. 507,000b. 508,000c. 507,500d. 508,500

Jenny collects music CDs.Last year she collected 465 CDs and this year she

collected 87 more.To find 465 + 87, Jenny first added 465 + 80 = 545.What does she need to do next to find the sum?

a. Subtract 7 from 465b. Add 7 to 465c. Add 7 to 545

d. Subtract 7 from 545

Eric is counting the equipment in the P.E. Department.He counts 30 tennis rackets, 14 hockey sticks, 28 badminton

rackets, and some footballs.What other information is needed to find how many

footballs Eric counted?

a. How many badminton rackets are damagedb. How many total pieces of equipment he counted

c. How many pieces of equipment were lost last yeard. How many baseballs the P.E. department has

The Slithering Snake Salon had 382 snakes on sale last week. It was a very busy week and 197 snakes were sold before the

sale ended. How many snakes had NOT been sold?( Use mental math to solve.)

a. 215b. 579c. 195d. 185

The Aquarium has 859 types of fish and 364 types of crustaceans.

Which number sentence shows the best estimate of how many more kinds of fish than crustaceans are at the aquarium?

a. 860 – 360 = 500b. 850 – 350 = 500c. 859 – 364 = 515

d. 859 – 364 = 495

The Amazon River is 6,437 kilometers long. What is 6,437 rounded to the nearest thousand?

a. 6,400 b. 6,440c. 7,000d. 6,000

Cole read a book for 113 minutes on Monday and 79 minutes on Tuesday.

Cole made a TEN as shown below. What is the missing number?113 + 79 = 110 + ____ = 192

a. 13b. 79c. 82d. 92

Brian loves to read. He read a 388 page book last night before going to bed. His little brother read a 63 page book

before going to sleep. Which is the best estimate of the total number of pages they read?

a. 350b. 450c. 451d. 440

To subtract 38 from 582 using mental math, Kevin first subtracted 582 – 40 = 542.What should he do next?

a. Subtract 582 - 2b. Subtract 542 - 2

c. Add 542 + 2d. Add 582 + 2

Christina collects insects and spiders. So far, she has collected 374 insects and 218 spiders.

Which number sentence gives the best estimate of the number of critters Christina has collected?

(use compatible numbers)a. 400 + 200 = 600b. 375 + 220 = 595c. 400 + 220 = 620d. 374 + 218 = 592

Norma went on a road trip. She drove 391 miles on Saturday and 418 miles on Sunday. Which is the most reasonable

answer for how much farther she drove on Sunday than on Saturday?

a. 27b. 87c. 187d. 809

TOPIC 2: NUMBER SENSEADDITION AND SUBTRACTION