Arrow Way
Make a Hundred!
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Mental Math
Word Problems
100

410 + 263 = ?

410 --> +200 ---> 610 ---> +60 ---> 670 --->    +3 ---> 673

100

199 + 257 = ?

200 + 256 = 456

100

380 + 220 = ?

500

100

364 + 500 = ?

864

100

The second grade class is planting flowers. They planted some but have 15 left to plant. If they had 96 to begin with, how many have they already planted?

96 - 15 = 81

They have already planted 81 plants.

200

275 + 350 = ?

350 ---> +200 ---> 550 ---> +50 ---> 600 ---> +20 ---> 620 ---> +5 ---> 625

200

297 + 478 = ?

300 + 475 = 775

200

477 + 233 = ?

710

200

425 + ____ = 725

300

200

The pet store has 275 fish for sale. If 50 are sold, how many are left?

275 - 50 = 225

There are 225 fish left for sale.

300
415 - 205 = ?
415 ---> -200 ---> 215 ---> -5 ---> 210
300

395 + 505 =?

400 + 500 = 900
300

265 - 134 = ?

131

300

535 - 200 = ?

335

300

Billy Bob has 124 marbles. Timmy Tom has 278 marbles. How many marbles do they have altogether?

124 + 278 = 402

They have 402 marbles altogether.

400

785 - ? = 250

785 ---> -200 ---> 585 ---> -50 ---> 535

CHECK IT!

535 ---> +200 ---> 735 ---> +50 ---> 785

400

798 - 298 = ?

800 - 300 = 500

400

549 - 239 = ?

310

400

882 - _____ = 582

300

400

The chicken farm has 378 chickens. 123 chickens runaway. How many chickens are left at the farm?

378 - 123 = 255

There are 255 chickens left at the farm.

500

? - 527 = 117

527 ---> + 100 ---> 627 ---> +10 ---> 637 ---> +7 ---> 644

CHECK IT!

644 ---> -500 ---> 144 ---> - 20 --> 124 ---> -7    ---> 117

500

892 - 302 = ?

900 - 310 = 590

500

400 - 73 = ?

327

500

25 tens + 13 tens = ?

38 tens = 380

500

The shoe store has 783 pairs of shoes. There are 56 pairs of red shoes and 89 pairs of blue shoes. After selling some, there are 498 left. How many pairs of shoes were sold?

783 - ? = 498

783 - 498 = ?

785 - 500 = 285

285 pairs of shoes were sold.

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