Show:
+10
-10
+100
-100
SURPRISE
100

458+10=

468

100

628-10=

618

100

777+100=

877

100

948-100-

848

100

8976-100=

8876

200

335+10=

345

200

745-10=

735

200

224+100=

324

200

100-100

0

200

2645+100=

2745

300

547+10=

557

300

260-10=

250

300

349+100

449

300

304-100

204

300

9831-10=

9821

400

10+658=

668

400

109-10=

99

400

100+829=

929

400

899-100=

799

400

2264+10=

2274

500

10+205=

215

500

805-10

795

500

100+165=

265

500

113-100=

13

500

Solve this 2 step word problem.

Chelsea bought in 27 donuts. Xavier also bought in 42 donuts. There are only 20 kids in our class. How many donuts are left over?

49 donuts left over.