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Introduction

Maak de sommen.


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1
18 - 14 =

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2
50 - 20 =

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3
80 - 70 =

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4
11 - 9 =

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5
14 - 7 =

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6
13 - 8 =

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7
17 - 11 =

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8
90 - 20 =

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9
19 - 12 =

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10
15 - 14 =