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Challenge
20

10 + 2 = 

12

20

35 - 11 =

24

20

100 + 134 =

234

20

1002

One thousand and two

20

1670 - 1000 = 

six hundred and seventy

30

45 + 20 = 

65

30

68 - 6 = 

62

30

357 - 124 =

233

30

587

Five hundred and eighty-seven 

30

450 + 400 = 

eight hundred and fifty  

40

189 + 11 =

200

40

120 - 10 = 

110

40

267 - 152 = 

115

40

20

twenty

40

83 - 70 = 

13

50

67 + 23 = 

90

50

83 - 41 = 

42

50

32 + 32 =

64

50

123

One hundred and twenty-three

50

654 - 24 = 

six hundred and thirty 

60

202 + 24 =

226

60

345 - 245 = 

100

60

500 - 40 =

460

60

13

Thirteen

60

3000 + 2000 =

Five thousand