Plus - easy
Minus - easy
Plus - hard
Minus - hard
100

5 + 20=

Twenty five - 25

100

10 - 5=

five - 5

100

22 + 33= 

fifty five - 55

100

45 − 12 =

thirty three - 33

200

20 + 20=

Forty - 40

200

20 - 15=

five - 5

200

12 + 46=

fifty eight - 58

200

86 − 29 =

Fifty seven - 57

300

30 + 11=

forty one - 41
300

30 - 20= 

ten - 10

300

17 + 27=

forty four - 44

300

94 − 48 =

forty six - 46

400
40 + 14=

fifty four - 54

400

50 - 25=

twenty five - 25

400

63 + 29=

ninty two - 92

400

73 − 59 =

Fourteen - 14

500

50 + 50=

One hundred - 100
500

60 - 11=

Forty nine - 49  

500

55 + 22 + 17=

Ninty four - 94

500

100 − 87 =

Thirteen - 13