Maak de som uit de tafel van 20 kloppend
Tafels
1.
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20
10
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2.
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20
5
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×
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20
3
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4.
×
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20
7
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5.
×
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20
10
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×
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20
5
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×
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20
8
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×
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20
4
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20
4
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10.
×
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20
1
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11.
×
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20
1
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12.
×
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20
10
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×
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20
6
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14.
×
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20
10
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×
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20
5
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×
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20
6
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×
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20
7
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18.
×
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20
10
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19.
×
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20
9
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20.
×
=
20
10
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21.
×
=
20
10
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22.
×
=
20
4
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23.
×
=
20
10
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24.
×
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20
10
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