Show:
doubling 1
doubling 2
halving 1
halving 2
mix
100

double 70 is

140

100

Double 70 is

140

100

half of 18 is

9

100

Half of 26 is

13

100

67 + ? = 100

? = 33

200

double 65 is

130

200

Double 26 is

52

200

half of 48 is

24

200

Half of 112 is 

56

200

18 x 5 = 

90

300

double 48 is

96

300

Double 54 is

108

300

half of 262 is

131

300

Half of 228 is

114

300

350 + ? = 1000

? = 650

400

double 115 is

230

400

Double 96 is

192

400

half of 720 is

360

400

Half of 290 is 

145

400

80 divided by 4 is 

20

500

double 325 is

650

500

Double 435 is

870

500

half of 940 is

470

500

half of 580 is

290

500

460 - 78 = 

382