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Addition and subtraction

Fill in all the gaps, then press "Check" to check your answers. Use the "Hint" button to get a free letter if an answer is giving you trouble. You can also click on the "[?]" button to get a clue. Note that you will lose points if you ask for hints or clues!
1. Fill in the missing numbers:

90 - = 20

50 - = 30

70 - = 40

80 - = 50

100 - = 100

60 - = 30

70 - = 30

50 - = 20

90 - = 70

80 - = 10



2. Fill in the missing numbers:

20 + = 70

40 + = 50

60 + = 90

30 + = 80

10 + = 50

50 + = 100

20 + = 60

30 + = 80

20 + = 90

30 + = 70