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Easy Numbers
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Addition
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Difficult Numbers
10

4

four

10

One

one

1

10

10+2= ?

12

10

5-1=?

4

10

13

Thirteen
20

18

eighteen

20

twenty 

twenty

20

20

6+3=?

9

20

9-3=?

6

20

17

Seventeen

30

15

Fifteen

30

eleven

11

30

5+3=?

8

30

11-2=?

9

30

42

Forty-two

40

22

Twenty-two

40

sixteen

sixteen

16

40

7+6=?

13

40

5-2=?

3

40

50

Fifty

50

31

thirty-one

50

One hundred and ten

One hundred and ten

110

50

1+6=?

7

50

7-2=?

5

50

60

sixty