x 2
x 10
bonus
regrouping (adding)
regrouping (subtraction)
100

2 x 10

20


100

3 x 10

30

100

100 x 3

300

100

139+155

294

100

100-19

81

200

2 x 6

12

200

3 x 40

120

200

12 x 3

36

200

177+199

376

200

787-519

268

300

2 x 9

18

300
3 x 90

270

300

15 x 5

75

300

204+89

293

300

345-136

209

400

2 x 7

14

400

70 x 3

210

400

13 x 6

78

400

316+109

425

400

601-579

22

500

8 x 2

16

500

22 x 3

66

500

1/4 plus 2/4 

3/4

500

789+619

1408

500

If you were born in 2002, how old will you be in the year 2045?

43