Maak de som uit de tafel van 15 kloppend
Tafels
1.
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15
4
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2.
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15
9
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3.
×
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15
10
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15
4
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15
6
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15
6
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15
10
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×
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15
10
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9.
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15
4
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10.
×
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15
10
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11.
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15
3
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15
3
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13.
×
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15
10
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×
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15
6
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15.
×
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15
4
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16.
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15
1
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17.
×
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15
9
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18.
×
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15
6
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19.
×
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15
9
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20.
×
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15
8
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21.
×
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15
4
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22.
×
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15
2
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23.
×
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15
1
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24.
×
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15
3
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