Number Line (add up)
Number Line (count back)
Standard Algorithm
Models
Random
100

234+345

579

100

900-450

450

100

423+375

798

100

523+146

669

100

Mr. Wu buys a box of 300 nails.  He uses 156 nails to build a deck.  He uses 98 nails to build stairs.  How many nails are left?

46

200

654-322

332

200

876-345

531

200

867-444

423

200

456-332

124

200

Marni has 354 dimes.  First, she gives 149 dimes to he sister.  The, she gets 210 more dimes from her mother.  How many dimes does Marni have now?

415

300

425+398

823

300

720-365

355

300

658+280

938

300

258+258

516

300

Carl has 254 baseball cards. He gives 145 to John and 56 Amy.  How many cards does Carl have left?

53

400

623-463

160

400

627-498

129

400

903-543

360

400

831-126

705

400

375 fish are swimming in a school.  First, 47 fish swim away.  Then, 116 more fish join the school. How many fish are in the school now?

444

500

Sam wants to bake 564 cupcakes.  He has 235 already made and has 267 baking right now.  How many more does Sam have to bake? 

62

500

Ruby found 543 pennies.  She gives 491 to her brother.  How many does she have left?

52 

500

Tommy wants to collect 654 stamps.  He found 445. He lost 234.  How many more does he need to collect?

443

500

525-139

386

500

Ms. Biglow bought 546 cookies.  She gave 156 to her class.  Then, Emma brought her 501 more. How many cookies does Ms. Biglow have now?

891

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