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multiplication
addition
minus
estimate
what's the number
100

4x5=?

20

100

20+50=?

70

100

70-5=?

65

100

534+200=734

500+200=700

100

1/3

2

200

5x8=?

40

200

70+21=?

91

200

49-5=?

44

200

250+340=590

300+300=600

200

111/113

112

300

6x5=?

30

300

50+60=?

110

300

56-7=?

49

300

234+150=374

200+200=400

300

289/291

290

400

2x1=?

2

400

200+510=?

710

400

967-5=?

962

400

601+400=1,001

600+400=1,000

400

356/358

357

500

10x10=?

100

500

400+600=?

1,000

500

5-5=?

0

500

300+700=1,000

300+700=1,000

500

1,111/1,113

1,112