Mentally add 10 or 100
Adding Three Digit Numbers
Adding 100s
Subtracting 10 or 100
Subtracting Three Digit Numbers
100

467+100=?

467+10=? 


567

477

100

475+235=

710

100

200+300=


500

100

500-10=

490

100

748-181=

567

200

320+100=?

320+10=?

420

330


200

235+367=

602

200

400+300=

700

200

345-100=

245

200

331-115=

216

300

275, __,__,575,__,775

275,375,475,575,675,775

300

345+435=

780

300

200+500=

700

300

674-10=

664

300

524-349

175

400

535,__,__,555,__,575

535,545,555,565,575

400

555+222=

777

400

600+200=

800

400

876-100=

776

400

259-198=

61

500
Regina and David were counting how much candy they got. Regina had 454 pieces of candy. David had 100 more pieces of candy. How many pieces did David have? 

David had 545 pieces of candy

500

785+150=

935

500

100+100=

200

500

__,632,__,432,__,232,__

732, 632, 532, 432, 332,232, 132

500

Ellie had 77 sea shells. She has 36 striped shells, 17 round shells. How many oyster shells does Ellie have?

Ellie has 24 oyster shells

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